Tying related HN posts together?

HN is awesome, but one place where it fails is doing a fuzzy lookup of your topic (by title and url) as you type them in. Sure it would make the interface a more complex, but it would help gather the discourse on umpteen threads into fewer threads. Perhaps it would still create a new thread with a new subject, but it would link to the older thread, maybe by setting the URL to be the older thread's URL. How about using the right side of the title/url/text area to have a scrollable dropdown of potentially related threads? Again, a minimal interface is great, but I see the same thread topics over and over again.

I'm sure there are quite a few threads on this very topic, but I'm not sure how to find them.