Still having this problem on Ubuntu 12.10 Touchpad twitchy on an HP G62 with a SynPS/2 Synaptics TouchPad even after I upgraded to 12.10.
Same problem here posted 2 days ago Touchpad sensitivity
I really have no idea what the problem is and why they didn't fix it. Using this OS less and less 'cause of this. Great OS but synaptics su kc s.