Right now the COD4 drivers page has a 'shakey hands' download that is a much faster speed than the 'jitter mod' in the current CODMW2. I did it this way because the 'slow' jitter mod in the COD:MW2 'The Works' code is better for some of the shotguns and like somebody said in another thread, famas and m16a4 and any of those guns that are 3-round burst by default.
I'll be adding a 'fast' jitter mod to the COD:MW2 driver shotly, in my opinion it's not very useful but will give people the ability to go rat-a-tat-tat with just about anything (accuracy will suffer)