Comment 24 for bug 54191

10.04 uses server 1.7, right?

Alan is right, the option you're looking for is Option "Emulate3Buttons" "off", see evdev(4) for more info. Configuration instructions are on https://fedoraproject.org/wiki/Input_device_configuration

in your fdi file, add an x11_options for the above option, example from the fedora wiki site:

<?xml version="1.0" encoding="ISO-8859-1"?>
<deviceinfo version="0.2">
  <device>
    <match key="info.capabilities" contains="input.touchpad">
        <merge key="input.x11_driver" type="string">synaptics</merge>
        <merge key="input.x11_options.TapButton1" type="string">1</merge>
    </match>
  </device>
</deviceinfo>

then restart HAL, make sure that lshal shows the option and then restart X.