Don't change anything... except:
You have about five seconds between pitches. If the batter is late, STRIKE. If it is the pitcher, BALL.
* Enough of this stepping out of the box, re-doing your gloves, etc, etc. Get up there and get to WORK!
Fan Interference - Ban them for the season!
Pitching Changes - Limit them to three pitchers a game.
* Enough of this one hitter, new pitcher crap. They can either bring it, or they can't.
Use the DH in the National League.
* With the exception of VERY FEW pitchers... these guys couldn't hit water if they fell out of a boat.
I've plenty more....