It might be a good idea to implement a button with that function if possible. Anyway, until the administrator says if it is possible to do so and when it could be available, (remember that he has a lot of pending work) when a user makes a mistake and wants to delete a post, they only have to send a PM to a local moderator (if the post is in a local subforum) or global moderator to remove it. It's normal to make those kinds of mistakes.