I think there should be a way to enable or disable the module for different items or categories. Particularly if you are having a store that sells different types of items this function would be useful.
Another thing, in version 2 of the module, when viewing an image in the full-screen preview, you could go to the next image without leaving the preview mode, but in version 3 you can't do that anymore. I got a complaint from my client that it wasn't there anymore (I showed him the demo that you put up).
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