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When I installed this plugin, I found that my remapping of : to ; did not work.
My remapping of ; to : did work however. I assume the problem is that Space is hooking into the ; key.
The commands I used in my vimrc:
nnoremap ; :
nnoremap : ;
It might, since space.vim is probably loaded after .vimrc. Either put
let g:space_no_character_movements = 1
in your .vimrc, to disable for fFtT;, movements altogether, or make sure that space.vim is loaded before you add that mapping.