I believe that Steam will be an issue in emulating IW4M, but once/if that is solved, there shouldn't be any problems. I do suggest bootcamp if you have a *legit* Windows 7 license.
I am not the owner of this account, just to clarify. I only have one Youtube account that has nothing to do with MW2/aIW/4D1.
Note: I have sent a PM for a forum username change. Please don't be concerned.
I believe in keeping the old moderators if they are still interested in the job. If there are not enough moderators, that shouldn't be a problem with NTAuthority