One change that might make for an interesting dynamic: Allow each team one five-second timeout, to be used over the course of the event. When the timeout is invoked, all play stops on the field to allow the alliance to strategize or regroup, particularly after a significant shift in gameplay happens. (The offensive muscle of the match tipping comes to mind.)
I imagine this being implemented as a second differently-colored button in the alliance station, next to the (individual) E-stop button. The usage could be tracked in scoring software (which also allows for the software to disable the button for teams that have used it). Alternatively, one operator badge could come with a coupon for the time-out attached, which would be given to a referee once it's been used. Stopping the match a second time, naturally, would be cause for a disqualification.
While it might throw off match scheduling a bit, a ten-second time-out used by forty teams (which is bigger than some regionals, and is about half of a divison in Atlanta) would add less than seven minutes onto the day. Regionals take up that much time playing the YMCA.
