Ok, so I've managed to write a kernel driver, as an extension to
psmouse, which recognises the touchpad and puts it into gesture-enabled
mode. Currently it recognises and uses vertical and horizontal two
finger scrolling, and also knows about the other gestures (but I haven't
got around to figuring out how they work with the input framework yet).

Check it out here:
$ git clone -b byd https://www.github.com/chrisdiamand/linux.git

The protocol is pretty simple - there's some ps2 init stuff, then a
sequence of magic bytes which I intercepted from the windows driver. It
returns 4 byte packets using the intellimouse protocol, except the last
bit (scroll/Z) takes different values depending on the gesture.

Some issues remain though:
- It's not supported in xf86-input-synaptics yet. This means you can't control 
parameters with synclient. I think things like intertial scrolling are handled 
here too.

- Gesture recognition seems to be being done by the touchpad itself
(firmware?) and not by the driver in the windows driver. Unfortunately
it doesn't do a very good job of it.

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https://bugs.launchpad.net/bugs/1424293

Title:
  BYD trackpad detected as PS/2 mouse

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