[Mailman-Users] User-focused list mgmt.

[postal worker]

Mailman's subscription model is list-based, vice user. You go to a 
list-related URL, see everyone subscribed, and enable/disable a user 
on THAT list. To go to another list, you log out and back in..

I've been asked for the opposite: You go to the management page, 
specify the user name, and see every list that USER is {not} 
subscribed to. You can then add/remove lists from the user's 
portfolio.

[Obviously, the user changes his/her own, period; the Admin changes anyone...]

Has anyone seen such an implementation, either as a Mailman mod or 
something else?