Hi Alan,
I've actually played with capacitive screens and multi-touch UIs, and we've considered this for the iFly. They demo great, and work well in a static environment. But in a small aircraft, and especially on warm afternoon, I found our screen selection to be the best option. When you are bumping around I thought it quite frustrating for every slight brush of the screen to be registered as input, and I thought pinch/zoom to be more difficult than a single touch to zoom in/out. Of course, opinions will differ on this, and I appreciate you posting your feedback on this.
Thanks!
Walter