Originally Posted by Crexis
...(extremely inconvenient, and on top of that, turning pages didn't seem to work while zoomed in)....
Turning page while zoomed in is possible.
When zoomed in, drag the pdf to the left (so you get nearer the right margin of the text). If you drag it slightly further than the edge of the page, you'll get a vertical black bar in the right margin. Tap that. That turns the page.
(The opposite dragging gives you a bar to page back.)