I like the idea of having the rt/lt trigger button controlling passes.
As for a the delay it's IMO the best way to do it. It gives awareness a tangible use. It's just like speed ratings or acceleration. The Manning's and Brady's should have an advantage not only for users but the cpu as well. This way you can watch a rookie with all the physical tools either grow into one of the best QB's or struggle because he can't grasp the mental aspects of football.