They took lean out in MW2 for the PC and that was ridiculous "they said it was unbalanced" just like dedicated servers were out "also stupid". Allow us to use lean just like the NPC's. It's balanced because all players can do it on PC. Bring on the Lean!
I think it would be sweet to have head tracking be incorporated into a lean function. For example, your webcam tracks your head, if you move your head to the left your character leans left. Does anyone else think this would be cool? It would be rather natural, I think that I do this out of habit anyway. Thoughts???