I have a pre-unibody MB from the Core 2 Duo era that only supports 2 finger scrolling natively. I know certain trackpads can be hacked to unlock further gestures, but my particular one is supposed to be unable to cope with more than 2 finger touch, BUT why does it not support the two finger pinch to zoom gestures, or maybe 2 finger forward/backward navigation?? Is there a hack out there that could unlock these, because I see no reason why it shouldn't be able to support it 
Josh
Josh