Ok dont mean to point out the obvious here lets start with rule one.
1.Shoulder charge even when it was legal normally resulted in a miss tackle and wasnt really what coaches wanted from there players.
Then there is the problem of the chances of the shoulder charge hitting a player in the head which would lead to a sent off or weeks out of the game.A player sent off pretty much would result in a lose.
2.Allow one player in your top 17 to be allowed unlimited interchanges by another nominated player out of the 17.
How could that even work,the thing that stands out to me there is if one of those players got injured now your a player down and the other team still has a unlimited interchange.(just wouldnt work)
3.Bar point 2, for the other three players on the bench bring the interchange down to 6 per game.
Limited interchange pretty sure is in the works and i think will improve the game.
4.Tries from bombs kicked inside the defenders 40 metre zone be worth ONLY one point. Not worth talking about just wont happen.
Sorry to be so neg towards your post but most of it just wouldnt work, limiting the interchange i think will work.