Sony :: VPCZ1 Touchpad

I've noticed a couple of annoying traits about my touchpad, which is probably related to the driver but was wondering if anyone else has noticed either of these:

Firstly, my touchpad sensitivity region does not extend all the way to the edges, especially towards the mouse buttons and the top of the pad. This can be seen by moving the cursor upwards (or down) and it'll stop before your finger actually reaches the border of the touchpad. I've disabled edge scrolling and other enhancements like edge regions. What's interesting is that once your finger is in the "dead zone" and the cursor no longer moves up, you can still move side-side. Horizontally, the problem isn't so bad. It's a bit like the touchpad is unaware where the physical edges are. Does anyone else have this?

Secondly, if you're using your middle finger for moving the mouse and your index finger comes near the surface, the mouse cursor freezes. I assume this is because it's detecting a multitouch (if you open the pressure graph, you don't have to touch the pad, it will detect the finger just above the surface). Adjusting the sensitivity only changes how hard you need to press for the cursor to move, but it'll still detect the presence of another finger above the pad and stop the cursor. Is it possible to disable multitouch? In an older laptop, the touchpad would work with two or more fingers by just averaging their motion which was kind of pointless but also would not have this problem.

Is there anything I can do to restore this "useless" behaviour? (or perhaps just respond to the strongest pressure point?)