The only easy interface for retrieving that sort of info now is something
like bin/config_list or bin/dumpdb, followed by a "grep" for the
item you're looking for. It's enough to extract the info from Mailman,
but it requires significant script hackery to do the sorts of extracts
you want to do.
I'm one of the site managers of a ListProc site that may be moving to
MailMan. (I'm the person who holds the list managers' and subscribers'
hands.) We have almost 200 lists with about 16,000 subscribers total.
I would like to be able to find out all the lists that are managed by a
particular man