There are two rules that really need to be changed in the off-season.
1. The advantage rule. It's ridiculous that you can play on after picking up a knock on and will keep the ball even if you play on and lose it because they haven't gone 10 metres. They really need to change that. If you play on, that's your advantage played straight away.
2. If a player wants to make a voluntary tackle, the defending team should be allowed to pick them up and drag them over the sideline or the in-goal. Either that, or the player making the voluntary tackle is to be penalized.