Wacom Table sends mouse events in case of modifier and click

In case of Tablet, when Key modifier plus click with pen happens windows sends it as mouse events which can be problemetic in some application.

It would be great in this situation modifier + clicks sends not synthesized mouse events to the application.

Further Middle clicks are not handled by current tablet if this can also be looked after that would be great.

Attached patch tries to handle following:

Tablet events should be considered Synthesized like touch events

• Middle clicks are not handled by the current tablet support

• Modifiers+clicks send not synthesized mouse events to the application