The problem with preventing TDs from overriding the Optional Rethrow rule is speed of play situations. On big downhill holes with a significant OB area far down the hill, I can see where TDs would want to have a required drop zone for the OB area for speed of play. Should the right of the TD to speed play with a drop zone override a player's option to trudge back up the hill for an Optional Rethrow? Or maybe the Optional Rethrow would have to be declared while the player is still on the tee and it cannot be a provisional based on whether the first throw turned out to not be OB. It would be the player's next throw with penalty no matter where the first throw landed.
Rater of the tossed arc.