Using 6.01 Network Edition, it seems impossible to create domain administrators the way they were meant to be created. How can this have slipped through testing?

As a Global Admin, I create an admin@domain.com, mark it as administrator, add it to the domain admin distribution list, and save it. Then I logon as admin@domain.com to the :7071 administration environment, and nothing happens.

Why is this not at the top of the list of things to get fixed? It puts a major dent in usability for large installations where we don't want to manage all domains but instead let a given domain be handled by their administrator(s).