Some people on my board are requesting the ability to delete posts or threads of theirs. This type of function is available in other forum software...would be cool to see here and I imagine not too difficult to pull off.
Mark stated this before, it would be like Me calling someone out, making a complete fool of them, then deleting the post like nothing had ever happened. It would be an unfair function for users to do this so it won't be considered as stated before. Otherwise if you do want this as a user function, you're better off creating it as an extension.