In 4+ years of playing, I've never seen a QB, on a called pass, pull the ball down and run with it for a gain. This could be significant for the development of the game. The days of Steve Young and Cam Newton may be coming.
It would happen occasionally up to 4.2. QB scrambles died in 4.3. It happened once in beta about a week ago, I think it was one of Ray's games. Time to change the QB weights! :)