1) provide option in settings to choose whether to autosave current position in book - when fast forward or backward from current playing position to find or review something it is very irritating for the new position to be saved, you've lost your last postion.
2) if auto save is off then on menu add 2 menu items "save position to bookmarks/save position to last autosave"
3) provide options to move forward/backward a specificable number of minutes