Thanks for the reply Gus.
We can certainly find a spare gpio pin and repurpose the existing 4-wire pins for the 5-wire interface. But that still leaves the question about the sw driver. I can certainly write a driver to interface to the GPIO and A:D to get the position information but I have two questions due to my newness with the .net microframework. First how do I feed the position data into the higher level touch driver? I have found TouchCollectorConfiguration.SetTouchInput but am not sure if this is the correct method or not. If so will gestures continue to be supported? The second question is how do I prevent the GHI driver from running as I don’t want it to interfere with my driver and think it is talking with a 4-wire device nor do I want it to take any CPU time.