The problem here DaVe is your adding more technicalities to what is already an overly technical game to umpire.The holding the ball rule needs to be clarified over the off-season.
I watched 7 games over the weekend, and there was absolutely no consistency with the holding the ball interpretation across those games.
The biggest issue is with dropping the ball I reckon. If there is no prior opportunity, the player is given leeway to just drop the ball or dispose of it by any means (legal or not). I understand if the ball is knocked out in a tackle, but a player should still have an onus of disposing the ball legally, whether he had prior opportunity or not.
it just seems like they've put the whistle away with holding the ball recently. It has to be blatantly obvious, and the player needs so much prior opportunity to get penalized.
I think the umps have to be hot on it. It clears the ball because it doesn't allow packs to form. If a player disposes the ball illegally, it's an automatic free kick. No question needs to be asked about prior.
Also, I hate seeing a guy tackles, then 5 jump on him. I'd also be banning the 2nd or 3rd opposition players jumping in. And I also think a players team-mate needs to be penalized for jumping in as well. The intention here is to ensure the ball is locked in and not cleared. If your own team-mate has the ball and is being tackled, you shouldn't be allowed to jump in and make a scrum. The onus is on the player to dispose of the ball.
In summary, no more 'stacks on' tackling'. If multiple tacklers or team-mates jump in, it's a free kick.
If what you said were to happen umpires would now have to start counting how many players were in a tackle.
I understand what you want but I think we need to be making the game easier to officiate, not adding further technicalities for the umpires.