Plugin Idea
I've seen on other boards that some have a chat app at the top of the page, or some that open in a popup. I just thought that a chat app would keep down post whoring. if we want to say something random, we can say it there.
I think the chat can be for the whole forum or just for specific sub forums.
If its too much to load, you could have it set up so you enable it in the CP and have it default to disabled so not everyone has it on?