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Probably won't be adding this myself since I'm not familiar with cscope. Pull requests are most welcome, though. You can checkout the extensions branch for how to create an extension.
FWIW, cscope is very similar in terms of functionality to ctags, but it finds functions/classes/whatever in a different way. I might take a look at adding this functionality, but with ctags (as that's what I use) sometime this weekend if I have time :)
BTW, an extension for ctags had already been added long before this request. I still don't see me adding one for cscope, but if anyone wants to give it a shot, take a look at the ctags one, I imagine it'd be somewhat similar.
cscope support seems to be present in the 'tags' extension, at least if your vimrc contains:
If I just:
let g:ctrlp_extensions = ['tag']
then I get full tag search that appears to be using my cscope database.