crane3 - thanks for all of the research you're putting into this!
Have you tried in a book that has multiple images? What I'm seeing is that when I have a book (usually in MOBI format) with multiple images (as far as I can tell, any size, any format), if I long-press an image, I am always taken to what I call the "gallery" - an area in which I am shown the first image in the book against a black background, with a series of thumbnails along the bottom. I can navigate through that gallery by swiping or selecting a thumbnail, and for a given image I can zoom using multi-touch as you described.
The gallery always starts me on the first image in the book, not the one I long-pressed on.
This sounds a lot like what you called the "basic" zoom mode, but from your description, it seems like you may have had only one image in the book.
I see this behavior on both my Kindle Fire HDX 8.9 and my Galaxy Note 2.
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