The only one I was thinking that you might want to think about is the chew clock. It is an awesome feature but I know I've heard guys complain about other guys taking the play clock way down before hiking the ball...
this feature allows you to call a play with 20+ seconds left on the play clock...and when you break the huddle and get to the line it runs the clock down to 10 automatically. This is especially great for running teams (

