Synaptic touchpads used to support a three finger tap for middle clicking in Ubuntu 10.10 (same as clicking the scroll wheel on a mouse.)
This critical functionality is broken in Ubuntu 11.10
How can I restore middle clicking on a touchpad?
Ubuntu – Middle click with a three finger touchpad tap on 11.10, How to restore this
mousetouchpad
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Best Answer
You could use a commandline programme called "synclient", which should be already on your system.
where "Tapbutton3" means a Two-Finger Tap, and the 2 is for middle click.
This method only works until restart (or some other mousesettings-program overrides it). To get this functionality permanently, put this in /usr/share/X11/xorg.conf.d/50-synaptics.conf before "EndSection"