So to clarify ppls positions...

Prestige Events (Worlds, Nationals) should be a strict one crew configuration only system, however official crew changes like any other class should be allowed (ie. if your crew/skipper is broken beyond repair)

Club racing should be race whichever F16 you bring, 1-up, 2-up, doesn't matter, anything goes, changes are allowed up to the start gun of each race.

Minor Events (States, regional) depends on event committee. Changing between 1-up and 2-up is allowed but cannot win major title, only minor titles (ie. junior, veteran, amateur? etc.)

Selection Events should be conducted as the event being selected for.

OT - Maybe "Pro" and "Amateur" divisions (for want of better terms) can be applied for some regattas. The "Pros" can't change crew configuration except for exceptional circumstances, the "Amateurs" can change. I know of a couple of Aust. classes that have something similar even at National Championships level, the "B" fleet races without spinnakers or with modified crew numbers but starts with the "A" fleet. Just something to think about for some regattas.