Im not sure if this was previously brought up, but there really should be an option to allow/disallow double posting in topics. If it is disallowed, and the user who is viewing the topic is the last poster in the topic, it should have a message appear saying "Sorry, you were the last user to post. Edit your post to add something in if you wish" instead of the quick reply textbox/full reply page.
Just thought I'd chip in.
