Pinned topics/posts are useful to help new users and we use them in all the categories. Some users end up directly in "unread" or "recent" and it would be helpful if we could pin topics to those as well.
Oh yes , please post based tags!
I like this idea to a limited extent, as a plugin to be able to assign certain mod powers to a user for specific threads could be a very useful thing.
You can explicitly follow a topic, perhaps you should also be able to explicitly mute one?
I would be interested in specifying Home page template as cgi parameter to the URL. That way I can skin Home page to match where visitors come from.
This can be useful