RE: And One More Thought
I have the same problem on a Dell Studio running WIN7.
I tried your suggested fix (in WIN7's control panel, you need to click "Devices and Printers" to get to the Mouse option; not exactly intuitive).
Unchecking "Enhance pointer precision" helped somewhat, but unchecking "Automatically move pointer to the default button in a dialogue box" helped somewhat more.
Still, the pointer jumps around the page periodically (3-4 times while I was typing this response.
Seems the folks at Synaptics need to do some more work on their product -- and manufacturers need to vet their third-party products before hoisting them on the paying public.