I think that's a great idea.  This would especially be true at an event such as Junior Nations where there are MANY new, and inexperienced, referees.

I also prefer option 1, to disable the top button.  If we allow the top button to score body shots it may lead to a more accurate match result in the no-head-contact divisions (the intent of the judges being fully recorded), but may lead to a less accurate match result in other divisions as inexperienced judges press the top button for body shots.  Training is the key to accurate scoring.

There should not be a visual cue when the disabled top button is pressed.  Currently you see the yellow for top button and blue for trigger.  Nothing should appear when the disabled top button is pressed.  That can serve as a clue for the judge that they should not be pressing the top button.  At the same time, however, it should be made very obvious to the TA, so they can have the center referee pull in the corners and remind them that head shots do not score in that division.  Could we have a popup box appear, or a flashing black circle/square under that judges scoring column on the TA's screen only?  Popup box might be too disruptive.  It's a good thing when a hand controller becomes disconnected, but this is a less critical issue.  So some type of flashing alert under the judges scoring column would be sufficient, I think.  The TA could then determine if the top button press was a one-time thing that the judge corrected or if they are hitting it repeatedly and need to be refreshed on the rule set that is in effect.

While we're discussing... can there be some type of visual clue on both screens to indicate which set of rules are in effect for the particular match?  At both qualifiers I worked we naturally had matches from no-head-contact, JSR, and adult rules divisions.  Some of them were intermixed, however.  It got confusing sometimes which rule set was in effect.  Usually the question initiated from a corner judge and it was clarified by the center and TA.  So the right thing happened in each match, but it added some time to the day.  Perhaps the competitors' names could appear in a different color depending on what rules they are fighting under?  Something with the color scheme would be a subtle way to do it, although I realize that is part of RingMaster's identity.  Anything that is easy to see from chair 2 and 3.  There is less need for this at Juniors, where the rules mainly change from day to day based on which age groups are fighting.  At qualifiers it changes more rapidly.

One more thing that I know has come up before.  This requires some thought, but I think it would really help if the squares showing which judges scored a point would flash for about 3-5 seconds after the point goes up.  We don't want the scores themselves to flash, but the squares indicating the scoring judges should.  That would really help the center referee determine if a point just went up when they want to do an 8-count or wave off a point.