Bookmarks

Ok, "Bookmarks" are confusing.  When I open a book, it goes back to where I was before.  That's nice if I'm reading for fun.

But if I'm reading for a class, when I go to class and move the "focus" (or current page, or whatever) and exit, it saves that.  Then when I go back to finish reading, I forget where I was.  It should ask me if I want to save the location where I exit.
Currently, when I'm reading a long book for class, before class I open the book and make a "bookmark" with 'finished reading here' so I can find my place again.

I also wish I could create two "thumbprints", so I could create a mark on page 9 and page 90 and flip back and forth quickly in class.  Neither of these would replace my "last page read" mark (that I just commented about).

Sometimes I get lost in class, the instructor will flip back a page or two real casually.  This isn't something that is gonna happen to ma and pa kettle.  But in a classroom....  It's worse if the "book" is a PDF because it takes so long to switch pages.