I used to rebuy automatically. Don't do it anymore. I stopped using PT4 so I just find it easier to keep track of my performance by simply watching my stack.
Plus, at the micro levels it really doesn't matter if you're playing full stack or not. People are going to pretty much play their cards and their canned strategies regardless of whether you're a little on the short side. The "good" regs aren't going to play aggro-stupid just because you're shorter, and they're not going to fold a good hand just because you're deeper. The opportunities that come along where you can double-up (i.e., when the size of your stack really matters) are far and few between.
If you're shorter, you can just play a little tighter.
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