For instance I have read most of the threads in the "XenForo Discussions & Questions" forum, but there are still several threads unread scattered through 24 pages of threads. At this time the only way to see those unread threads would be to navigate each page looking for unread threads.
It only needs to show the unread sorted by last post, no need to make things complicated. I don't think vb or ipb has this feature.
What do you think?