I'm beginning to agree with daveMustane that the touchpad settings are best when at their defaults.
Here are the contents of my /etc/X11/xorg.conf
The mtrack developer offers "dispad" to disable the trackpad while typing (actually it disables clicking while typing). It seems to work well. To get it up and running:
Identifier "Multitouch Touchpad"
Option "CorePointer" "true"
Option "Sensitivity" "0.95"
EndSection # "Multitouch Touchpad"
Then, to make dispad run upon log-in, go to the Unity dock, type "Startup Applications."
wget -q http://www.dev.fatedmariner.org/packages/dispad/ubuntu/dispad_0.1_natty_amd64.deb
sudo dpkg -i dispad_0.1_natty_amd64.deb
Choose "Add" and enter the following information:
and click "Save."
Comment: Disable trackpad while typing.