Forbidden page is hardcoded

I know there is a topic 3 years old, but since this is still not addressed – do you have plans to make the “forbidden” page more customizable ? The guy in the previous post suggested filters, but I’d rather say – you just need to let users select a WordPress page to be rendered and for the dynamic part, which is the request ID – just make a shortcode, so if someone wants to include the request ID – he can put the shortcode on the page and that’s it (I won’t :-)). Of course – if no page is selected, then just render the ugly thing that shows up now :-).