bbPress.org

Maybe I am missing something because I don’t totally understand the benefit of changing the topic template, assuming you mean topic.php.

What I would really like to do is auto-filter all the displayed posts so that the only posts you could see at any time are the posts of a specific forum, which can be changed by an outside wrapper.

This forum is going to have to heavy rely on this categorization, so really I would like to make some sort of a hook that will filter on forum if the user is on tags.php or index.php.