I think the rule i would change in hockey would be a very simple one. And would take the game back a whole 50 years with a bunch of big old morons trying to hurt each other. Take away boarding penalties. Add those earth shattering hit those career ending injuries. People hitting people so hard the glass shatters and players going flying into the stands. Promotes a more physical version of the game as well. no 5 foot 8 players going behind the net to score. Get those bone crushing earth shattering hits back into the game. while we are at it bring back the elbow hits. why not, dirty broken jaw plays over the blue line. Every player could go to lose a few more teeth and hav some more concussions. Those hard hits from days of old are back with these rule changes and hockey would be tougher and better for it.