With this, you can hand out links to pages with your server RDP already configured - just send the link to the admin and let them administer.
How well does this work with dynamic username/password? If we wanted to leave those fields blank, and maybe have the webpage prompt on open?
Something missing is RDPClip.exe, which synchronizes the copy/paste clipboard data between your local session and any remote sessions. Though I'm not sure how that would work in some cases.