This may seem weird, but what If you could see what posts a user has made in a certain thread by going to their profile, rather than searching. You know how you can see posts and threads a user has participated in by going to someone's profile? Why not take that a step further. I suggest this because it's annoying to go to a user's profile and and look at a thread they posted in a while back which has ~100 new replies, thus making you wade through a load of replies to just find what you want. If this feature is already there and I'm just stupid, please inform me

You see that "Sort by" below the bottom post? You'll wanna make that say Author instead of Post time. Hit "Go" and find the person (it's in alphabetical order by current username) and it'll show all their posts in that particular topic chronologically.

^This is the best way to accomplish this