Hard Mode is a plugin which disables the arrow keys, the hjkl keys, the page up/down keys, and a handful of other keys which allow one to rely on character-wise navigation. The philosophy behind Hard Mode is that you'll never master Vim's advanced motion and search functionality if you can fall back on the anti-pattern of fumbling around your code with the arrow keys.
To enable it:
:call HardMode()
To disable it:
:call EasyMode()
To enable it by default, add this to your vimrc:
autocmd VimEnter,BufNewFile,BufReadPost * silent! call HardMode()
You may also wish to add the following to lines to your vimrc:
nnoremap <leader>h <Esc>:call EasyMode()<CR>
nnoremap <leader>H <Esc>:call HardMode()<CR>
With those lines added, presuming your leader is still the \ key, you
can enable Hard Mode by pressing \H while in Normal-mode and disable it
by pressing \h while in Normal-mode.
If you don't have a preferred installation method, I recommend installing pathogen.vim, and then simply copy and paste:
cd ~/.vim/bundle
git clone git://github.com/wikitopian/hardmode.git
Once help tags have been generated, you can view the manual with
:help hardmode.
GPLv2