This would be a great win indeed. See also
Yes, this would be very useful. See also comments to this request which also suggests an easy to implement solutions.
Please please, add this feature, I find all PDF readers useless for reading scientific papers. There one needs to jump back and forth between main text, figures and references.
This feature would be very easy to implement: just add an (optional?) button which jumps to the position before previous jump. The algorithm is trivial:
1) if the user activates the page scrollbar at the bottom, remember the position
2) proceed as usual
3) when the dedicated button is clicked, save the position and jump to the position remembered previously.
Multiple positions can be maintained by allowing pop-up menu on longer press where I can select from history of remembered positions, 3 should be enough: main text, references, figures.