you can have the back and menu buttons semi persistent. open up a pdf as your last read document - i know it works off of an sd card, but i don't know if it work off the main storage.
if you leave it as you last read document in your read it now you can now tap the little "read it now" book icon in the menu and you'll have the menu and back buttons available. it works with every program i've tried except those that use up the full screen.
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