Does this have anything to do with you being notifyed if someone directly quotes your post, or just if someone makes a post after yours in a topic?
hmm... based on your inquiry, it seems like you can already look up if someone quoted your via search? (just guessing)
but no, that's not what i meant. nothing about notifying. just a new way to sort. the existing "Show new replies to your posts." organizes the posts by the latest reply, even if it's a 3-month-old topic. sometimes it would be convenient to organize based on your own latest posts' times. hopefully that makes sense...