This has been suggested before. The problem is that there needs to be enough people to create a large enough reason to create such rooms and forums. The few people that come here asking for this would mean the room and forum would mostly be empty and unused. Usually mods recommend starting your own chat group for smaller niche categories. Going up to to 'Community' then 'Chat Groups' is where you would go to start your own. But you would also be responsible for advertising it. The best way to do this is to put it in your signature if you are going to post frequently.
