Option 1: There are a lot of options. If I had to create a new penalty in hockey and to add A LOT of action is that you are not allowed to have 5 players in your own zone. So when you're playing defense, one of your players must stay outside of the defensive zone. This would help both sides of the ice. For one, on attack, you'd always be 5v4 and this would increase the number of goals. Second, even if you are 4 players at the back, you have one who is in neutral zone waiting for you to get the puck, pass it to him and then he will get be able to go on a breakaway or maybe just a great opportunity, then he would score goal and who doesn't like breakaways and goals scored like that. Getting back to the penalty, so not allowed to have 5 players in the back. this promotes having more one man advantage.