In v4.6 the running QB is nullified because you need a long pass and/or one that garners sacks to achieve a scramble. Therefore, it's a fruitless mission. You'll get 10 yards running on a PA streak, per se and then the very next play (same play call) you'll get sacked for -10 yards. You'd be chasing your tail in a whirling dervish attempting to have the QB scramble.
Only 1 play yanks the QB around based on design: 113 Post Flags.
Mmm, I remember one time in a past version the QB took off on the 3-1-1 medium pass, however, that was like Haley's Comet and I couldn't figure out how to make it happen otherwise.