I'm having a chuckle at some of the responses - 'I need help from somebody to manage this!'
No, you really don't. Ask anybody who's ever refereed Futsal.
I've refereed plenty of Futsal games there, and in that game a sent-off player can be replaced after 2min (or earlier if that team concedes a goal). Managing that is absolutely no different to managing a sin bin in outdoor - keep an eye on the clock, wave the player on.
Though once again, it's a 'solution' to a problem that shouldn't exist.
If referees were just allowed to be stricter on any of the above offences, it wouldn't be a problem. Got 8 players mobbing you for a decision? Book them all.
Handbags between 10 people? Book the half dozen that are just trying to aggravate the situation.
If referees could actually hold players accountable for their actions they'd learn, quick smart. It worked with shirt removal to celebrate a goal.
(and yes, I know we don't book all the players mobbing for dissent at once)
Referees put up with a LOT before the card comes out, and this is largely due to match control, not ruining the game, blah blah. Make a caution more significant and referees will be even more reluctant to do anything, IMO.
That, and they'll also be much more reluctant to issue a red card - 'yellow card and sin bin will do'.
Still, I'm all for using these tournaments for experimentation. Though it seems that most/all of the experiments just get rejected anyway.....