Using 7.3 RH. in my XF86Config-4 I use:

Section "InputDevice"
Identifier "Mouse0"
# Modified by mouseconfig
Driver "mouse"
Option "Device" "/dev/mouse"
Option "Protocol" "MouseManPlusPS/2"
Option "Emulate3Buttons" "yes"
Option "ZAxisMapping" "4 5"
EndSection

It works with Mozilla and I have not checked other programs.
John