It's a cool trick, I did this for a while and keybound my "-" and "+" keys for zoom, but never liked it. You need to scroll wheel in and out IMO.

What did I do for 2 extra keybindings? I bought a mouse for $25 with two mouse buttons on it, its great, but sadly can't use them through keyclone because it acts as a "click" so that sucks a bit =[

:O