I'm not sure about this but I think the reason you can't move the page (to left/right) after it is fully contained within the screen (horizontally) is b/c of the conditions Tigran has put in lines 754 and 767 of libdjvu.c file. I think if you make those conditions trivial then you could move the page to left/right indefinitely. Unfortunately I am not running Linux on my machine these days and can't compile the files to check it.
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