Mouse Scroll Wheel not working for Ubuntu 9 under VMware Fusion

In my /etc/X11/xorg.conf file, I had these (oddly, correct) setting for the mouse. They were originally commented out, but not below.

# commented out by update-manager, HAL is now used
Section "InputDevice"
  Driver "vmmouse"
  Identifier "VMware Mouse"
  Option "Buttons" "5"
  Option "Device" "/dev/input/mice"
  Option "Protocol" "IMPS/2"
  Option "ZAxisMapping" "4 5"
  Option "Emulate3Buttons" "true"

However, the hal settings are a mess, and not able to handle my mouse (Logitech Mx900.) Rather than try to wrestle hal into order, I added these setting to override hal.

Section "ServerFlags"
  Option         "AutoAddDevices" "false"

Now it works!!