I've seen a few feature request to get this functionality implemented, yet as far as I know that never happened.
I've seen some board entries that suggest, that there is a way to modify the user interface to add the close button.
Does anyone know how to do that, and if that really works?
Thank you in advance.
Close Button for Ticket requesting users
Of course you could add a close button if you know PHP/HTML if you are willing to modify the core code files. Yes if you do it right it will work. Good luck.