I changed the RSS feeds for the forums so that each feed includes the content of the new posts. You can now subscribe to a category (Tasks Pro™), a forum in a category (Tasks Pro™: Feature Requests), and to a thread in a forum (Tasks Pro™: Feature Requests: I’d like to see X). You can also subscribe to a feed of the 20 latest posts in any forum.

Once this has had a chance to settle a little and I’ve gotten any bugs fixed, I’ll apply the changes to the Use Tasks forums and release the code as a PunBB mod if there is any interest.