The existing feeds appear to show only the initial item in a thread, not further posts. That's of limited use to me.
I'd be interested in a feed containing any new posts. I currently go through almost every forum to see which topics have new posts. I do this by hand, so having a feed would be faster for me, even with filtering out the things I'm not interested in. I think a feed like that could have a pretty short time frame for the data request -- new in the last day or 2 sounds about right. Don't know if anyone else here is a feed junkie, but that'd suit my wishes!
Intermountain (Cascades and Coast range) oak savannah, 550 - 600 ft elevation. USDA zone 7a. Arid summers, soggy winters