Couple changes I'd like to see.
Call the rule book as it is. There would be a ton of penalties, but like every other sports league players will have to adjust if they want to play.
International head shot rule. I really don't like that an accidental hit to the head is a penalty or even a 5 minute major, but what I hate more is not knowing what the hell constitutes a head shot in the NHL period. Go with the 5 minute major for any contact and be done with. It forces players to play smarter.
Smaller goalie equipment. Either that or larger nets. I prefer smaller equipment as it wouldn't change the look of the game as much.
Final one and this is just a longshot that I've never heard of, but 2nd period the visiting team gets last line change. Would give us a chance on the road to have one period(our worse period apparently anyway) to shelter our players. Would still give us two periods at home.