I'd like to see something that searches through my PT database and finds "questionably played" hands. Things where I was bluffing into multiple players, or check/calling with a really good hand, failing to raise for value with a killer nut flush draw against lots of opponents, etc.

When reviewing hands, one of the hardest things is weeding through the mass of standard hands to find the ones you want to study. Something like pokergrader I'd think, since it already grades your play overall. It'd just need to grade each hand.