There is no shortcut that I know of, but you might try viewing the PDF in landscape mode, rather than the default portrait mode. To change the screen orientation, press the Text (AA) button (just left of the Home button), and go down to "Screen Rotation" to select. The page-forward/back keys are more awkward to use that way, but I do find it much easier than having to navigate while in zoom mode.
I hope that helps!
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