Section "InputClass"
    Identifier "touchpad enable three finger middle button"
    Driver "synaptics"
    MatchIsTouchpad "on"
    MatchDevicePath "/dev/input/event*"
    Option "TapButton3" "2"
EndSection

Section "InputClass"
    Identifier "touchpad ignore SynPS/2 Synaptics duplicate"
    MatchProduct "SynPS/2 Synaptics TouchPad"
    Option "Ignore" "on"
EndSection