[Lynne]

If you add forumid=x to the end of the link, that will make it so there is only one forum showing the rss feed, but all someone has to do is change forumid=x to forumid=y and then they can see the other forum rss feed anyway. The only thing I can think of to do what you want it to make a plugin using the external_start hook location and basically say that forumid=x no matter what the link may say. I suppose you can play around with that idea.