I'm pulling this from some older documentation, so I'm not sure if it'll work but try this:
Quote:
Although the touchpad on a laptop computer emulates a 2-button PS/2 mouse as the default behavior, the tpconfig package enables full control of the device. For example, setting OPTIONS="--tapmode=0" in /etc/default/tpconfig will disable pesky "click by tap" behavior.
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Maybe post just the section of your xorg.conf or XFree86.conf file that deals with your mouse as well. You may need to adjust the driver, or add some options like:
Option "MaxTapTime" "180"
To register a tap as a click.