I think they could improve the game by using the existing rules and adjusting the interpretations. Don't need to mess with it much.
Want to reduce stoppages? Call holding the ball quicker, and reward tackles like they do in the Eastern league.
Want to stop deliberate out of bounds? Call more of them like you did this year, only even more - it will soon stop.
As for allowing throwing as suggested on here, ridiculous. But I'd like to see umpires looking for it in packs and penalising it more. I reckon West had more throws than handballs in the first quarter of the GF. That would slow the game down a little too, that seems to be an aim of all this.
And if the umpires stop circling SO FAR WIDE of the play they may be in a position to call all of these.