If the ref stops play for an injured player to receive treatment, they must be taken straight off and into the changing room to be assessed. even a miraculous recovery would leave thier comrades a man down for a couple of mins.
When a player is penalised for "denying a clear goal scoring opportunity", the opposing captain can chose whether the ref awards a red card or a penalty (even if not in the box).
have a "powerplay" in each half where the offside rule doesn't apply.