Do you need something like this: Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
# Option "Protocol" "auto"
# Option "Device" "/dev/mouse"
# Option "ZAxisMapping" "4 5 6 7"
Option "Protocol" "Microsoft"
Option "Device" "/dev/ttyS0"
Option "Emulate3Buttons"
EndSection
Putting it in a 01-mouse.conf file, either alone or along with the above posted InputClass, has no effect.
Also putting Xorg-7.7 after the xf86-input-mouse entry in onboot.lst has no effect.
Finally, I haven't found the manner to disable hotplugging without locking the whole system.
Attached is my Xorg.0.log.