Well, I make lots of panorama's, and I don't think moving over the entire picture will increase the user experience. However, only moving from left to right will, and I hope it's possible to implement both options.
I want to keep my website simple, and most visitors won't even notice the zoombuttons. IMO they don't need to but if they move there mouse over the picture, which will happen, than is slides nicely from left to right and back.
Would be a to cool feature to lock it in horizontal movement
