I like a slot limit also, takes 6 - 7 years for a spotted bass to get to 15", seems a shame to kill them. Plenty of 12" spots out there and they are much tastier than the bigger bass.
Tournament guys probably don't like the slot limit idea, but it seems you could make an exception for tournament weigh ins as long as the fish were released alive. But then again, I can see enforcement issues with that.