Comment 5 for bug 1002736

The rationale is here

http://lists.x.org/archives/xorg-devel/2012-May/030886.html

The a lot of them have been broken for quite some time and untested, and the driver has so many obscure features it is becoming unmaintainable. If this one works I'll upload it to xorg-edgers, but synaptiks will need to be fixed in the distro for 12.10 because xserver-xorg-input-synaptics will most likely be going into it