When not using fit-to-screen mode (for me, this is
usually in full-screen mode) and having pages that are
larger than the full screen, it would be nice to have
keyboard accelerators that would jump to the page
edges. So, for instance, start by default in the upper
left, ctrl-right-arrow jumps to upper right,
ctrl-down-arrow to bottom of page, ctrl-left-arrow to
lower left. The actual keystrokes would come from the
Gnome HIG or whatever equivalent KDE has.
Alternately, have these keystrokes be a percentage of
the visible page so someone with lower resolution would
jump, say, a quarter page down but someone with higher
res would jump to the bottom.