Enable 5 button mouse
From MEPIS Documentation Wiki
On the mepislovers forum, user bontoogobeanso posted this:
This is for the section after the PS/2 mouse section in your /etc/X11/xorg.conf settings:
Section "InputDevice" Identifier "USB Mouse" Driver "mouse" Option "Device" "/dev/input/mice" Option "Protocol" "ExplorerPS/2" Option "ZAxisMapping" "4 5" Option "Buttons""7" Option "CorePointer" Option "ButtonMapping""1 2 3 6 7" EndSection
I confirm it works perfectly with my Logitech 5 button mouse (MX500 model).

