Shifts
1. Yes
2. Yes, key is that the movements must not simulate the start of a play. Strictly speaking whether the defense reacts or not is not determinative of whether there is a false start.
3. No
4. Not a penalty. The key is the QB's movements must be such that he does not simulate the start of a play and hence be a false start. The QB is the same as any other back, he may shift, go in motion, etc. He just must do it a fashion which does not simulate the start of a play.
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