I don't know if you're still considering a vertical 'select' menu, and I also do not know if this is possible in epub's/webkit.
In a regular browser you have the ability to use the context when clicking/selecting something to determine whether or not an option should be made available or not.
Now, I see when you select an image, you get the same menu, where all actions are still active but none of these do anything, likely since the selection is an image.
I have seen so many e-readers in the last weeks that I honestly can't remember if Marvin used to open the image in a 'popup' or not, but popping a menu that does not have anything that will act on the image is kinda useless.
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