Add this to /usr/share/hal/fdi/policy/10osvendor/10-x11-input.fdi:

    <match key="info.product" string="Logitech USB Trackball">
        <merge key="input.x11_driver" type="string">evdev</merge>
        <merge key="input.x11_options.Buttons" type="string">11</merge>
        <merge key="input.x11_options.EmulateWheel" type="string">true</merge>
        <merge key="input.x11_options.EmulateWheelButton" type="string">8</merge>
        <merge key="input.x11_options.XAxisMapping" type="string">6 7</merge>
        <merge key="input.x11_options.YAxisMapping" type="string">4 5</merge>
        <merge key="input.x11_options.EmulateWheelClickToo" type="string">0</merge>
    </match>