diff --git a/init.lua b/init.lua
index 853b79b..49d2e1b 100644
--- a/init.lua
+++ b/init.lua
@@ -1 +1,5 @@
-require('cosmic')
+local ok, err = pcall(require, 'cosmic')
+
+if not ok then
+  error(string.format('Error loading core...\n\n%s', err))
+end
diff --git a/lua/cosmic/config/config.lua b/lua/cosmic/config/config.lua
new file mode 100644
index 0000000..b7357a6
--- /dev/null
+++ b/lua/cosmic/config/config.lua
@@ -0,0 +1,37 @@
+-- Override Cosmic configuration options
+
+--[[
+local config = {}
+
+config.statusline = {
+  main_icon = '★',
+}
+
+config.lsp = {
+
+  -- true/false or table of filetypes {'.ts', '.js',}
+  format_on_save = false,
+
+  servers = {
+
+    -- enable/disable server
+    eslint = false,
+
+    -- enable non-default servers (todo: support for custom server configs)
+    rust_analyzer = true,
+
+    efm = {
+      -- specifc to efm, e.g. 'eslint', 'prettier', 'lua'
+      disable_formatters = {},
+    },
+
+   tsserver = {
+      -- disable formatting all together
+      format = false,
+   }
+
+  }
+}
+
+return config
+]]
diff --git a/lua/cosmic/config/editor.lua b/lua/cosmic/config/editor.lua
new file mode 100644
index 0000000..9a53945
--- /dev/null
+++ b/lua/cosmic/config/editor.lua
@@ -0,0 +1,6 @@
+-- Override Cosmic editor options
+
+--[[ local opt = vim.opt
+opt.tabstop = 4
+opt.softtabstop = 4
+opt.shiftwidth = 4 ]]
diff --git a/lua/cosmic/config/init.lua b/lua/cosmic/config/init.lua
new file mode 100644
index 0000000..401eaac
--- /dev/null
+++ b/lua/cosmic/config/init.lua
@@ -0,0 +1,47 @@
+-- DO NOT TOUCH :)
+local ok, user_config = pcall(require, 'cosmic.config.config')
+
+if not ok then
+  error(string.format('Error loading user config...\n\n%s', user_config))
+  error('No user config, using default instead...')
+end
+
+if user_config == true then
+  user_config = {}
+end
+
+-- these settings will be merged with any settings definined in config.lua
+local default_config = {
+  statusline = {
+    main_icon = require('cosmic.core.theme.icons').ghost,
+  },
+  lsp = {
+    format_on_save = false, -- true/false or table of filetypes {'.ts', '.js',}
+    servers = {
+      eslint = true, -- enable/disable server
+      -- rust_analyzer = true, -- enable non-default servers (todo: support for custom server configs)
+      efm = {
+        format = true, -- true or false
+        disable_formatters = { 'eslint' }, -- e.g. 'eslint', 'prettier', 'stylua'
+      },
+      tsserver = {
+        format = false, -- disable formatting all together
+      },
+    },
+  },
+}
+
+local config = vim.tbl_deep_extend('force', default_config, user_config)
+-- default servers that can be formatted
+local formatting_servers = { 'efm', 'eslint', 'tsserver', 'sumneko_lua', 'rust_analyzer', 'gopls', 'pyright' }
+local user_servers = vim.tbl_keys(config.lsp.servers)
+
+function config.lsp.can_client_format(client_name)
+  if not user_servers[client_name] or vim.tbl_contains(formatting_servers, client_name) then
+    return false
+  end
+
+  return (user_servers[client_name].format == true)
+end
+
+return config
diff --git a/lua/cosmic/config/mappings.lua b/lua/cosmic/config/mappings.lua
new file mode 100644
index 0000000..8a882ff
--- /dev/null
+++ b/lua/cosmic/config/mappings.lua
@@ -0,0 +1,6 @@
+-- Additional remaps
+--[[
+local map = require('cosmic.utils').map
+
+map('i', 'jj', '<esc>', { noremap = true, silent = true })
+]]
diff --git a/lua/cosmic/core/statusline/init.lua b/lua/cosmic/core/statusline/init.lua
index 78f97f6..e963faa 100644
--- a/lua/cosmic/core/statusline/init.lua
+++ b/lua/cosmic/core/statusline/init.lua
@@ -7,6 +7,9 @@ local utils = require('cosmic.utils')
 local colors = require('cosmic.core.theme.colors')
 local highlight = utils.highlight
 local icons = require('cosmic.core.theme.icons')
+local config = require('cosmic.config')
+
+local main_icon = config.statusline.main_icon
 
 local get_mode = function()
   local mode_colors = {
@@ -93,7 +96,7 @@ gls.left = {
   },
   {
     Ghost = {
-      provider = BracketProvider(icons.ghost, true),
+      provider = BracketProvider(main_icon, true),
       highlight = 'GalaxyViModeInv',
     },
   },
@@ -380,7 +383,7 @@ gls.short_line_left = {
   },
   {
     GhostShort = {
-      provider = BracketProvider(icons.ghost, true),
+      provider = BracketProvider(main_icon, true),
       highlight = { colors.bg, colors.white },
     },
   },
diff --git a/lua/cosmic/init.lua b/lua/cosmic/init.lua
index 1de6634..73173f2 100644
--- a/lua/cosmic/init.lua
+++ b/lua/cosmic/init.lua
@@ -3,3 +3,17 @@ require('cosmic.pluginsInit')
 require('cosmic.compiled')
 require('cosmic.mappings')
 require('cosmic.editor')
+
+do
+  local ok, err = pcall(require, 'cosmic.config.editor')
+  if not ok then
+    error(string.format('Error loading custom editor settings...\n\n%s', err))
+  end
+end
+
+do
+  local ok, err = pcall(require, 'cosmic.config.mappings')
+  if not ok then
+    error(string.format('Error loading custom mapping settings...\n\n%s', err))
+  end
+end
diff --git a/lua/cosmic/lsp/init.lua b/lua/cosmic/lsp/init.lua
index 5064203..6fc2f10 100644
--- a/lua/cosmic/lsp/init.lua
+++ b/lua/cosmic/lsp/init.lua
@@ -5,3 +5,4 @@ vim.lsp.handlers['textDocument/signatureHelp'] = vim.lsp.with(vim.lsp.handlers.s
 vim.lsp.handlers['textDocument/hover'] = vim.lsp.with(vim.lsp.handlers.hover, {
   border = 'single',
 })
+
diff --git a/lua/cosmic/lsp/providers/defaults.lua b/lua/cosmic/lsp/providers/defaults.lua
index 3d81fa5..265eccb 100644
--- a/lua/cosmic/lsp/providers/defaults.lua
+++ b/lua/cosmic/lsp/providers/defaults.lua
@@ -1,5 +1,8 @@
+local config = require('cosmic.config')
 local M = {}
 
+local auto_format_lock = false;
+
 function M.on_attach(client, bufnr)
   local function buf_set_option(...)
     vim.api.nvim_buf_set_option(bufnr, ...)
@@ -8,10 +11,22 @@ function M.on_attach(client, bufnr)
   -- Enable completion triggered by <c-x><c-o>
   buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')
 
-  local formatting_servers = { 'efm', 'eslint' }
-  if vim.tbl_contains(formatting_servers, client.name) then
+  if config.lsp.can_client_format(client.name) then
     client.resolved_capabilities.document_formatting = true
     client.resolved_capabilities.document_range_formatting = true
+    -- check user config to see if we can format on save
+    if config.lsp.format_on_save and not auto_format_lock then
+      auto_format_lock = true -- just run autocommand once
+      local format_filetypes = ''
+      if (vim.tbl_islist(config.lsp.format_on_save)) then
+        for _, ft in pairs(config.lsp.format_on_save) do
+          format_filetypes = format_filetypes .. '*' .. ft
+        end
+      else
+        format_filetypes = '*'
+      end
+      vim.cmd(string.format('autocomd BufWritePre %s lua vim.lsp.buf.formatting()', format_filetypes))
+    end
   else
     client.resolved_capabilities.document_formatting = false
     client.resolved_capabilities.document_range_formatting = false
@@ -45,4 +60,6 @@ M.root_dir = function(fname)
     or util.root_pattern('tsconfig.json')(fname)
 end
 
+M.autostart = true
+
 return M
diff --git a/lua/cosmic/lsp/providers/efm.lua b/lua/cosmic/lsp/providers/efm.lua
index 942cbf2..0990bce 100644
--- a/lua/cosmic/lsp/providers/efm.lua
+++ b/lua/cosmic/lsp/providers/efm.lua
@@ -1,30 +1,75 @@
 local util = require('lspconfig').util
+local config = require('cosmic.config')
+local formatters = {}
 
-local stylua = {
+formatters.stylua = {
   formatCommand = 'stylua -s --quote-style AutoPreferSingle --indent-type Spaces --indent-width 2 -',
   formatStdin = true,
 }
 
-local prettier = {
+formatters.eslint = {
+  lintCommand = 'eslint_d -f unix --stdin --stdin-filename ${INPUT}',
+  lintStdin = true,
+  lintFormats = { '%f:%l:%c: %m' },
+  lintIgnoreExitCode = true,
+  formatCommand = 'eslint_d --stdin --fix-to-stdout --stdin-filename=${INPUT}',
+  formatStdin = true,
+}
+
+formatters.prettier = {
   --  formatCommand = 'prettier --stdin-filepath ${INPUT}',
   formatCommand = 'prettierd "${INPUT}"',
   formatStdin = true,
 }
 
-local filetypes = {
-  css = { prettier },
-  html = { prettier },
-  lua = { stylua },
-  javascript = { prettier },
-  javascriptreact = { prettier },
-  json = { prettier },
-  markdown = { prettier },
-  scss = { prettier },
-  typescript = { prettier },
-  typescriptreact = { prettier },
-  yaml = { prettier },
+local filetype_defaults = {
+  'css',
+  'html',
+  'lua',
+  'javascript',
+  'javascriptreact',
+  'json',
+  'markdown',
+  'scss',
+  'typescript',
+  'typescriptreact',
+  'yaml',
 }
 
+formatters.defaults = {
+  eslint = {
+    'javascript',
+    'javascriptreact',
+    'json',
+    'typescriptreact',
+    'typescript',
+  },
+  prettier = {
+    'css',
+    'html',
+    'javascript',
+    'javascriptreact',
+    'json',
+    'typescriptreact',
+    'typescript',
+    'markdown',
+    'scss',
+    'yaml',
+  },
+  stylua = { 'lua' },
+}
+
+local languages = {}
+for formatter, filetypes in pairs(formatters.defaults) do
+  -- disable specific formatters
+  if not vim.tbl_contains(config.lsp.servers.efm.disable_formatters, formatter) then
+    for _, filetype in pairs(filetypes) do
+      languages[filetype] = languages[filetype] or {}
+      table.insert(languages[filetype], formatters[formatter])
+    end
+  end
+end
+
 return {
   init_options = { documentFormatting = true, codeAction = true },
   root_dir = function(fname)
@@ -34,6 +79,6 @@ return {
       or util.root_pattern('.eslintrc.js')(fname)
       or util.root_pattern('tsconfig.json')(fname)
   end,
-  filetypes = vim.tbl_keys(filetypes),
-  settings = { languages = filetypes },
+  filetypes = filetype_defaults,
+  settings = { languages = languages },
 }
diff --git a/lua/cosmic/lsp/providers/init.lua b/lua/cosmic/lsp/providers/init.lua
index 93e2e6c..ce042a1 100644
--- a/lua/cosmic/lsp/providers/init.lua
+++ b/lua/cosmic/lsp/providers/init.lua
@@ -1,4 +1,5 @@
 local default_config = require('cosmic.lsp.providers.defaults')
+local config = require('cosmic.config')
 local lsp_installer = require('nvim-lsp-installer')
 
 lsp_installer.settings({
@@ -16,24 +17,61 @@ lsp_installer.settings({
   },
 })
 
+-- initial default serverse
+local requested_servers = {
+  'eslint',
+  'efm',
+  'tsserver',
+  'sumneko_lua',
+  'jsonls',
+  'cssls',
+  'html',
+}
+
+-- get disabled servers from config
+local disabled_servers = {}
+for config_server, config_opt in pairs(config.lsp.servers) do
+  if config_opt == false then
+    table.insert(disabled_servers, config_server)
+  elseif not vim.tbl_contains(requested_servers, config_server) then
+    -- add additonally defined servers to be installed
+    -- todo: how to handle non-default server opts?
+    table.insert(requested_servers, config_server)
+  end
+end
+
+-- go through requested_servers and ensure installation
+local lsp_installer_servers = require('nvim-lsp-installer.servers')
+for _, requested_server in pairs(requested_servers) do
+  local ok, server = lsp_installer_servers.get_server(requested_server)
+  if ok then
+    if not server:is_installed() then
+      server:install()
+    end
+  end
+end
+
+-- print(vim.inspect(requested_servers))
+-- print(vim.inspect(disabled_servers))
+
 lsp_installer.on_server_ready(function(server)
   local opts = default_config
 
+  opts.autostart = true
+  if vim.tbl_contains(disabled_servers, server.name) then
+    opts.autostart = false
+  end
+
   if server.name == 'sumneko_lua' then
-    local config = require('cosmic.lsp.providers.lua')
-    opts = vim.tbl_deep_extend('force', opts, config)
+    opts = vim.tbl_deep_extend('force', opts, require('cosmic.lsp.providers.lua'))
   elseif server.name == 'tsserver' then
-    local config = require('cosmic.lsp.providers.tsserver')
-    opts = vim.tbl_deep_extend('force', opts, config)
+    opts = vim.tbl_deep_extend('force', opts, require('cosmic.lsp.providers.tsserver'))
   elseif server.name == 'efm' then
-    local config = require('cosmic.lsp.providers.efm')
-    opts = vim.tbl_deep_extend('force', opts, config)
+    opts = vim.tbl_deep_extend('force', opts, require('cosmic.lsp.providers.efm'))
   elseif server.name == 'jsonls' then
-    local config = require('cosmic.lsp.providers.jsonls')
-    opts = vim.tbl_deep_extend('force', opts, config)
+    opts = vim.tbl_deep_extend('force', opts, require('cosmic.lsp.providers.jsonls'))
   elseif server.name == 'eslint' then
-    local config = require('cosmic.lsp.providers.eslint')
-    opts = vim.tbl_deep_extend('force', opts, config)
+    opts = vim.tbl_deep_extend('force', opts, require('cosmic.lsp.providers.eslint'))
   end
 
   -- This setup() function is exactly the same as lspconfig's setup function (:help lspconfig-quickstart)
diff --git a/lua/cosmic/packer.lua b/lua/cosmic/packer.lua
index 90c2373..e77bd81 100644
--- a/lua/cosmic/packer.lua
+++ b/lua/cosmic/packer.lua
@@ -24,6 +24,8 @@ if not present then
 
   if present then
     print('Packer cloned successfully.')
+    packer.sync()
+    packer.compile()
   else
     error("Couldn't clone packer !\nPacker path: " .. packer_path .. '\n' .. packer)
   end
diff --git a/readme.md b/readme.md
index 6f33ede..c125f0a 100644
--- a/readme.md
+++ b/readme.md
@@ -30,7 +30,7 @@ Full featured native LSP functionality!
 - Explore files with [nvim-tree](https://github.com/kyazdani42/nvim-tree.lua)
 - Fuzzy finder and some LSP actions with [Telescope](https://github.com/nvim-telescope/telescope.nvim)
 - Floating terminal with [vim-floaterm](https://github.com/voldikss/vim-floaterm)
-- Easy LSP installation with [nvim-lsp-installer](https://github.com/williamboman/nvim-lsp-installer)
+- Auto LSP installation with [nvim-lsp-installer](https://github.com/williamboman/nvim-lsp-installer)
 - Autocompletion provided by [nvim-cmp](https://github.com/hrsh7th/nvim-cmp)
 - Snippet support via [LuaSnip](https://github.com/L3MON4D3/LuaSnip)
 - Session management with [auto-session](https://github.com/rmagatti/auto-session)
@@ -52,20 +52,22 @@ _While CosmicNvim is geared specifically toward TypeScript/JavaScript developmen
 ```
   $ cd ~/.config
   $ git clone git@github.com:mattleong/CosmicNvim.git nvim
+  $ nvim .
 ```
 
-You will need to set up Packers compiled file via the steps below:
-
-1. Start NVIM
-2. Run `PackerUpdate` & `PackerCompile`
-3. Restart NVIM
-4. Install LSP servers, `:LspInstallInfo` (hit enter to install)
-
 Additional Cosmic installation [details](https://github.com/mattleong/CosmicNvim/wiki/Installation).
 
 Additional LSP server installation [details](https://github.com/mattleong/CosmicNvim/wiki/Installing-LSP-servers).
 
-## Mappings
+## Configuration
+
+[Cosmic configurations](./lua/cosmic/config/config.lua)
+
+[Add additional mappings](./lua/cosmic/config/mappings.lua)
+
+[Add addtional vim options](./lua/cosmic/config/editor.lua)
+
+## Default Mappings
 
 [File Navigation](./lua/cosmic/core/navigation/mappings.lua)