Hmm, you are right. Well I wouldn't worry too much of the offensive output of the supporter, as I thought of it more of just as a diversion of sorts. So yeah, I think putting a time limit is the more appropriate adjustment.

As for balance, yeah it is kinda hard and you are right with it being relative to what classes you want to compare your work against. What I'm concerned about also is how different abilities affect the overall power level. But with all the comments and critiques I think I'll get the hang of this bit by bit. So thanks.