I have found that using touchtype="moveto" gives me a much smoother panning on my iPad especially when using many hotspots which interferes with the movements.
However there are no ways of controlling the speed or not even the friction. Touchfriction has no effect on moveto.
I think this is a large lack in the controls for touch devices. Maybe also an option for reversing the movement and perhaps some sort of horizont control which keeps the panning at horizont so that you need a larger movement to tilt.
Hans