Such an easy thing to do.Number 6 is the big one. A couple of years back they did this and the congestion cleared up big time. Then, as the AFL always does with new interpretations, forgot about it after 5 weeks and we had the rolling maul midfielder again. It's the simplest fix for the congestion around the ball and the best one.
While the stand the mark has reduced congestion, teams still have time to set up behind the ball.
Throwing it up quickly would increase scoring because of deceased time to set up defensive systems.