Oh, and I think you should be able to delete a thread if no one has posted to it, otherwise, its stuck. I would test it, but wouldn't want to spam the boards with test threads, =/
I like the idea about 'if replies, then no delete.' That way, if you screw up while entering a new thread and hit the Enter button by accident, or you realize that someone else has already started a similar thread (perhaps about seat-saving ) you can kill the baby thread before it grows.
Oh, and I think you should be able to delete a thread if no one has posted to it, otherwise, its stuck. I would test it, but wouldn't want to spam the boards with test threads, =/