Manage user project membership

This is a great tool and I am looking forward to what it will become in the future (If I find the time I might help with development as well :) ) .
The feature I am requesting is not really necessary as the functionality can be achieved through other means, but when a new user is added, it becomes rather tedious to make it member of each project it should have access to , specially when the list of projects starts to grow with time. (I personally intent to keep old projects around in the system, even when we are not actively developing them).
I think it would be a nice feature in the future for an admin to select any user and see list of all the project it is a member of, and easily add or remove projects on this list.