Take that a step further — PPs run the full length regardless of goals scored, and also introduce 1-minute penalties for things like puck over glass and minor obstruction. Give the refs a bit of breathing room to make penalty calls without changing the entire course of the game.
What you’ll get is refs who are willing to call it by the book, players who avoid breaking the rules, ultimately a lot more open ice and free-flowing play. Scoring would only go up slightly, but the game would be far more exciting to watch.