Comment 36 for bug 615892

I am successfully using the following modified version of Darren's suggestion for my RAT9 on an updated and unpatched ArchLinux box:

Section "InputClass"
        Identifier "R.A.T.9"
        MatchUSBID "06a3:0cfa"
        Driver "evdev"
        Option "Buttons" "17"
        Option "ButtonMapping" "1 2 3 4 5 0 0 8 9 7 6 12 0 0 0 16 17"
        Option "AutoReleaseButtons" "13 14 15"
        Option "ZAxisMapping" "4 5 6 7"
EndSection

Horizontal scrolling is working as well! Yay!