Thanks a lot Mark!
Yeah, gestures like this are in our plans. I will use your good suggestions for reference, when we get to it soon.
I was thinking, though, if fanning would be better with just one or two fingers needing to touch. I understand your analogy, but to make it simpler and less straining for your hand maybe it would work better with just one finger dragging up/down to flip back/forth. What do you think?