I can see the benefit. Unfortunately, the volume keys on my device (Nook Color) are clunky and not precise at all. Sometimes when I press the Vol- ONCE it take me all the way to the bottom of the page in the browser as if I have held it down for long. Due to that I have eschewed the use of Vol keys for paging. It is a little jarring to lose your position when you are reading.
But I can see on another device I would definitely switch to using Vol keys for paging.
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