Comment 3 for bug 400697

As discussed on IRC that disables any click event. An alternative to make the touchpad more usable would be to disable bottom area of the touchpad so that you can use the physical buttons (on the Dell Mini 10v) without triggering other events such as movements, taps or scrolling.

Make sure that you have xserver-xorg-input-synaptics 1.1.2-1ubuntu2 in Karmic and type:

xinput set-int-prop "SynPS/2 Synaptics TouchPad" "Synaptics Area" 32 0 0 0 4000

where 4000 is the new bottom edge. If you want to increase the size of the blacklisted area you can try something smaller than 4000.