Wheel Emulation on 2 Button Trackball

I have a generic trackball mouse with 2 buttons, I want to press both buttons and move the wheel, with results similar to that of a scroll wheel. The following is the relevant section of my xorg.conf

Code:

---

Section "InputDevice"
        Identifier        "Configured Mouse"
        Driver                "mouse"
        Option                "CorePointer"
        Option                "Device"                "/dev/input/mice"
        Option                "Protocol"                "ImPS/2"
        Option                "Emulate3Buttons"        "true"
        Option                "EmulateWheel"                "on"
        Option                "EmulateWheelButton"        "4"
EndSection

---

The sticking point seems to be the 'EmulateWheelButton" option, when set to 3, I have the desired functionality, but not when I press both buttons, instead it works whenever I hold the right button. This obviously poses a problem as right-click functionality is quite important. The above configuration does not give me the scroll wheel functionality at all.

Anyone done this before or have any bright ideas?

you need to have 2 buttons listod to make this work probably
use the app 'xev' to figure out buttons to choose

also try changing the protocol