serio:
But this litte thing from the mouse is way to fragile for my needs.
Too fragile in what respect? If it's for industrial use, you should design your control so that users can't apply forces directly to the sensors. Assuming you use robust buttons/knobs mounted securely to a suitable enclosure, and assuming you arrange for the enclosure to be suitably sealed and mounted, I don't see why there should be any special requirements to ruggedize the sensors. If there is, you could take the optics from a mechanical mouse and make your own encoder disk, or make the whole thing from scratch using a home-made encoder disk and a couple of switches or optical sensors.