Well, pressing the far left side of the screen will make you go back a page. Far right and middle make you go forward a page. And for the most part it only responds to a tap or a swipe, yes.
For the second question about resting your thumb on the page - It might turn the page when you lift your thumb or it might also highlight the word your thumb was resting on when you lift it. But if you let it rest gently in the very corner bottom of the screen often times won't do anything.
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