When viewing content off a shared server there should be a way for users to keep track of what they have viewed. Since you need myPlex for accessing a shared server I propose to keep track of viewed videos and the viewing positions via myplex.
I would love to see a function to mark movies in shared libraries as watched/unwatched.
duplicate - pls vote here -> http://forums.plexapp.com/index.php/topic/46197-very-popular-multi-user-mode/