Great idea, but, no, it doesn't seem to work. I have a macbook pro, but it's about a year old. It doesn't support pinching, but I know it supports multitouch, because I use it for sideways scrolling. Interestingly, the simulator does seem to recognize if I'm using two fingers, because it behaves differently using two fingers than one finger. But, it doesn't simulate multitouch. This would be a great feature enhancement to the simulator though. But, one thing they'll never be able to simulate is the accelerometer.