As pointed out by CoachJM in another post, this is covered under
"Rule 12.06
(c)(2) During the course of the game ONLY COACHES are allowed to make up rules which have no foundation in the text, official interpretations, or history of the rules. APPROVED RULING: While the umpire may, at his sole discretion, entertain discussion of such made up rules with the coach (strictly for the entertaiment value), there will be NO ENFORCEMENT of any such rules."
