[tomsem]

If the book does not have proper hyperlinks, perhaps setting a bookmark at the beginning of the notes section will improve navigation to that location. Then you can go there via the View Notes & Marks menu item, which will open a list of Notes and Bookmarks. That list can be filtered to show just Bookmarks, once you have one or more Bookmarks set (tap menu for Show... options and pick Your Bookmarks), and after that View Notes & Marks will list only bookmarks until you change the Show... option (or Kindle restarts). Same can be done for books without NCX to simulate a chapter list that you can use to navigate.

Until I discovered the Notes and Marks list filter (it is one of the more obscure Kindle features), I was rather miffed that bookmarks could be so useless as ad hoc navigation points. But it is not really that bad after all.

Pop up footnotes (again depends on having proper hyperlinks) of the PW2 and hopefully on other devices in the future save a lot of jumping around in the book.

But I'd love to be able to split the screen and display two different locations in the book, or two different books, and be able to jump more easily between books (I guess HDX has something like the latter, anybody use that?).