Pi-hole in a larger environment where Admins and Users coexist.
Rather than just giving a "password" field to whitelist the blocked domain, a typical user should also have the option "Request Access" with a small box for justifying the request being sent to the Admin.
This could just be a simple section with a notification icon for anyone logging in to the Admin panel to review, accept/deny requests. It would also be nice to have email notifications, I realize this would require a lot more work.