I just had an idea for an enhancement to ask for. It's in the category of "egg in your beer", or "what will they think of, to ask for, NEXT?"
In addition to "Forward" and "Back" controls when in the "photo - thread - view", is is conceivable that you could add Zoom, Pan and Tilt controls?
It seems as if it would be very difficult, but you do implement many miracles.