Configure third button of a 3M Ergonomic Mouse

Configure third button of a 3M Ergonomic Mouse

I've just bought a 3M Ergonomic Mouse, model EM500GPL, and for pointer
movement and left/right click it works fine. But I'd like to know if it's
possible to configure the third button to behave the way the makers
intended.
Holding the third button down and then moving the mouse up should cause a
scroll-up action in the target window; holding the third button down and
then moving the mouse down should cause a scroll-down action.
I'm using OpenSUSE 12.3 with KDE 4.10.5. I suspect the desired behaviour
is not something that can be achieved easily, but I'd be very happy to be
proved wrong.