Per discussion on IRC:
Currently members of the Project-Admins team can't manage their own board which is quite paradoxical. It's been said that it is due to the technical restrictions as a side-effect of disabling the project members to add other members.
I propose to enable the workboard management and forbid adding of new members by current members by policy. Current memebers are trusted users, so it does not have to be enforced by the software blocking which blocks other useful features along.