Groups? ARGHHHHHHHH scary! 

Good idea about the tackling although I find the benefits you gain from diving at every tackle (i.e knocking the ball out of the oppositions hands, knocking the AI back) tend to outweight the negatives, which are of course missed tackles.

However I will try and see. Can you have a go at the rucking rule and tell me what you think. Maybe it needs a couple of taps to add even more players in?!

Cheers