It would be nice if there was an interface to disable a domain
without deleting it from the database, i.e. an is_active field of
sorts, and a UI e.g.

  vmm domainenable [domain]
  vmm domaindisable [domain]

Obviously, I can introduce the database field myself and amend my
queries, but I think this would be a useful feature to have by
default.

And then maybe even extend it to users and possibly aliases…