diff --git a/.vimrc b/.vimrc
index 17abcd8..c3fd491 100644
--- a/.vimrc
+++ b/.vimrc
@@ -1,7 +1,6 @@
 filetype plugin indent on
 syntax on
 
-"colorscheme wildcharm
 colorscheme habamax
 
 set nobackup nowritebackup
@@ -9,7 +8,7 @@ set noswapfile
 
 set number
 
-set tabstop=4
+set tabstop=8
 set shiftwidth=4
 set softtabstop=4
 set expandtab
@@ -54,16 +53,17 @@ set signcolumn=auto
 :nnoremap > :cn<CR>
 :nnoremap < :cp<CR>
 
-:nnoremap \\ :noh<CR>
+:nnoremap g/ :noh<CR>
 
 :nnoremap E :Ex<CR>
 
 :nnoremap <space>z :set relativenumber<CR>
 :nnoremap <space>x :set norelativenumber<CR>
 
-xnoremap p "_dP
+"xnoremap p "_dP
 
 :nnoremap gb :make<CR>
+:nnoremap gr :make run<CR>
 
 :nnoremap gw :bdelete<CR>
 
@@ -93,3 +93,65 @@ function! AlignLine(line, sep, maxpos, extra)
     let spaces = repeat(' ', a:maxpos - strlen(m[1]) + a:extra)
     return m[1] . spaces . m[2]
 endfunction
+
+" Window Operations
+function! CreateOrSelectWindow()
+    let win_count = winnr('$')
+
+    if win_count == 1
+        execute 'vsplit'
+    endif
+
+    execute '2wincmd w'
+endfunction
+
+function! PutIntoShade()
+    let max_width = float2nr(&columns * 0.95)
+    let min_width = float2nr(&columns * 0.5)
+
+    if winwidth(0) > min_width
+        execute 'vertical resize ' . min_width
+    elseif winwidth(0) <= min_width
+        execute 'vertical resize ' . max_width
+    endif
+endfunction
+
+:nnoremap ! :1wincmd w<CR>
+:nnoremap @ :call CreateOrSelectWindow()<CR>
+:nnoremap # :call PutIntoShade()<CR>
+
+" Preserve paste line column
+function! PasteAbove()
+    let c = col('.')
+    normal! P
+    call cursor(0, c)
+endfunction
+
+function! PasteBelow()
+    let c = col('.')
+    normal! p
+    call cursor(0, c)
+endfunction
+
+:nnoremap P :call PasteAbove()<CR>
+:nnoremap p :call PasteBelow()<CR>
+
+" Todo Comments highlights
+" Colors: https://vim.fandom.com/wiki/Xterm256_color_names_for_console_Vim
+" NOTE: These are confirmed to work with 'habamax' color scheme.
+:highlight TODOPerf    term=bold,underline cterm=bold,underline ctermfg=93  " purple
+:highlight TODOHack    term=bold,underline cterm=bold,underline ctermfg=214 " orange
+:highlight TODOTodo    term=bold,underline cterm=bold,underline ctermfg=51  " cyan
+:highlight TODONote    term=bold,underline cterm=bold,underline ctermfg=46  " green
+:highlight TODOFix     term=bold,underline cterm=bold,underline ctermfg=196 " green
+:highlight TODOWarning term=bold,underline cterm=bold,underline ctermfg=214 " orange
+
+augroup HiglightTODO
+    autocmd!
+    autocmd WinEnter,VimEnter * :silent! call matchadd('TODOPerf',    'PERF:',    -1)
+    autocmd WinEnter,VimEnter * :silent! call matchadd('TODOHack',    'HACK:',    -1)
+    autocmd WinEnter,VimEnter * :silent! call matchadd('TODOTodo',    'TODO:',    -1)
+    autocmd WinEnter,VimEnter * :silent! call matchadd('TODONote',    'NOTE:',    -1)
+    autocmd WinEnter,VimEnter * :silent! call matchadd('TODOFix',     'FIX:',     -1)
+    autocmd WinEnter,VimEnter * :silent! call matchadd('TODOWarning', 'WARNING:', -1)
+augroup END