Just to be clear, this wouldn't "allow" them to receive a copy; it would require them to do so. I'd be hesitant to do this on a list without asking the folks whose accounts are set ACK NOREPRO if they wanted to remain that way.
-- Russ
Users can always send the command themselves to switch between REPRO and NOREPRO. You don’t have to do anything to allow them to. I’m not even sure that you can prevent them. They just send the same command without the “FOR” clause.