mobile quarterback rule?

[O-schemer]

What do you guys think about having a rule that says your qb must be mobile at all times. I have been thinking about making my solitaire league this way. Here is how it would work.

1. The qb would be on a base that "drops back", but no further than 20 yards. This would force the coach to watch the qb and the wr's.

2. You could also put a time limit on the drop back. You could have the clock set at 3 seconds at which time the coach has to stop the board and pass or scramble. The scramble would not be as threatening as it is now, because not enough time has lapsed to make the middle wide open. This is why a lot of leagues won't allow scrambling.

3. You could allow the qb to sit in the shotgun, but with the time limit, he wouldn't have all day to sit there with the board running even if the rush isn't there. What do you guys think?