Up until version 11.04 of ubuntu I could simply add an option to my X InputClass to emulate a third mouse button for my HP TrackPoint like this:

Section "InputClass"

    Identifier "Trackpoint"

    MatchIsPointer "on"

    Option "Emulate3Buttons" "True"

EndSection

I recently updated to the 11.10 to test the new features and I am satisfied so far but the before mentioned method stopped working. I suppose it's related to the x-server update.
I also tried adding a udev rule like this:

ENV{x11_options.Emulate3Buttons}="True"

which is also ignored.

Is there anything I missed or something important that has changed?