I would really love to see a $$->BB-Converter-HUD-Thingy. I sometimes fail to count the bets going in because I play on another table etc. and then I have to do unnecessary arithmetics. I know dividing by 2 isn't much of a challenge, but it's unnerving if you are trying to think about so many other things at the same time. In addition to that, I would love an overlay, that displays each players stack in BB instead of $$. It would also help me a lot not to tilt.