how to remap ';' key, without affacting/slowing down its original function?

I'm looking at my keyboard for any un-used but still good keys left for my own maps 

I know ; was by default used as a repeat movement key. I thought that's not quite frequently-used, but still hesitating to block it.

so thinking of ; key,  that makes sense only when:

1) a fFtT key has been executed first.

2) usually, after changed a line, it's no use

based on that, is there any way to use ; as a leading key for a new map? eg:

;;

;a

;b

if this works, then I can have at least 20+ more handy keys for my own.

plus, I already used comma key (,) as leading key of my own, but I just ran out of it (about 30)..

thanks!

regards

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