The NFL won't call it the Jim Harbaugh Rule, but it might as well. The San Francisco head coach is one of those the league's competition committee has in mind when it took action to keep coaches from wandering onto the field. Harbaugh was on the field more than once during the playoffs, and the NFL wants that to stop -- making sure coaches understand that's where players, not coaches, belong. So it will make sideline discipline a point of emphasis this year, with coaches warned that they can and will be flagged if they don't comply.