I'm interested to increase "the speed" of resizing splits. It's annoying to press `<C-w> <` a few times just to move split a few pixels...
" Decrease height / width
nnoremap <A--> <C-W>-
nnoremap <A-/> <C-W><
" Increase height / width
nnoremap <A-+> <C-W>+
nnoremap <A-*> <C-W>>