A feature I've noticed from playing around with zoom levels in a PDF:
Only levels 1 to 7 are available from the volume/zoom keys on the side.
Level 1 is whole-page (how the pdf would appear as printed)
Levels 2 to 2 are reflowed.
If you set it to level 8 (from the menu) you get a zoomed-in whole-page style view. But then you have to scroll around. Sometimes the borders mess up, and it doesn't work very well in horizontal mode, but it shows promise.