I had an issue with the synaptic mousepad on my Macbook moving my cursor around at random. The fix is to turn it off for 1 second after a key is pressed:
"Also, some people think the touchpad is too sensitive to accidental movements when typing on the keyboard. To solve this, use syndaemon to inactivate the touchpad for 1 second every time the keys are touched.
syndaemon -d -t 1"
With a little side of applesauce...
©2006 Shannon Eric Peevey