I'd much rather see a 30-sec pitch clock (yes... I know the union will fight that tooth-and-nail). I went to AAA game some years ago and they had one. Got through 4 innings in about an hour. It was AWESOME!
I fully support the three batter minimum for pitchers. The last few innings of games had become excruciating. As far as the pitch clock, there has always been a 20 second limit between pitches with no one on base but it has seldom been enforced. I would like to see a clock displayed in the stadium.