Comment 23 for bug 615892

Yarro:

Steps to get RAT 7 working:

1) Open terminal

2) Type (without quotes) "sudo gedit /etc/X11/xorg.conf" (Enter password if needed)

3) In the text file that opens up, add this to the bottom:

Section "InputClass"
        Identifier "Mouse Remap"
        MatchProduct "Saitek Cyborg R.A.T.7 Mouse"
        MatchDevicePath "/dev/input/event*"
        Option "ButtonMapping" "1 2 3 4 5 6 7 2 9 10 11 12 0 0 0"
EndSection

4) Save file

5) Restart computer (or just restart the X server if you know how)

6) Use mouse!

Above solution is based on Mitch Walker's comment #17.