I tried this out on Spancil Hill, since that's the classic one when it comes to threads discussions, and I couldn't find the feature. Therte's a lot of songs out there, and each one would need to be done by hand, but that's one that should get priority.
In thge meantime the supersearch facility throws up the threads with the song titles as well as the DT songs, so it's not too hard hunting out the discussions anyway. But this is a very handy new facility. Max strikes again.