[Zwart]

If that's really all you want, I actually think this could be an option for the single page display mode where it will display as much of the next page on the screen as it can instead of only showing one page at a time.

Yes, that's exactly what I need, and for what I already use "Vertical scrolling" on portrait documents. Would be great if you could implement this feature anytime soon. By the way, I find it ironic how your website states: "Choose between horizontal scrolling, vertical scrolling, half pages in portrait, or two pages at a time." If only that was true!