" toggle list
nnoremap <F2> :set list!<cr>
" rotate tab size
nnoremap <silent> <F3> :let &ts=(&ts*2 > 16 ? 2 : &ts*2)<cr>:echo "tabstop:" . &ts<cr>
This works pretty good for me. F2 toggle list-chars. F3 rotate tabstop.
nnoremap <leader>K :exe 'Ag' expand('<cword>')<cr>
nmap <leader>G <Plug>(openbrowser-open)
nnoremap <c-e> :<c-u>CtrlPLauncher<cr>
noremap <leader>f :<c-u>CtrlPFunky<cr>
I use this mappings for 10 years.