Illegal motion would be easy, guys trying to shift players around all the time. All they would have to do is allow guys to do whatever they want and if they put multiple people in motion then it results in illegal motion. There have been times when I motioned a guy, forgot about it and tried to motion another one.
I completely agree that penalties need to be updated and fleshed out. Glad the brought back the late hit. It used to be that you could pick guys off after the play if you wanted. Ultimate cheap shot.
I would love to see Madden create more negative effects of low awareness in players.