Dovecot and virtual domains with different namespaces

Question

I've got dovecot 2.1.7 setup with virtual domains and now would like to have different public namespaces for each of the virtual domains.

E.g.

workdomain.com
-> INBOX (private namespace)
-> projects (public namespace)
-> customers (public namespace)

fundomain.com
-> INBOx (private namespace)
-> funmails (public namespace)

Currently my configuration is

namespace inbox {
  type = private
  separator = /
  prefix = INBOX/
  inbox = yes
  location = maildir:/var/mail/vhosts/%d/%n

  [..]
}

namespace {
  type = public
  separator = /
  prefix = Public/
  location = maildir:/var/mail/vhosts/%d/public

  [..]
}  

... meaning that I have a "Public/" namespace for each virtual domain. So, I'd be looking for something like

if workdomain.com {
  namespace { A }
  namespace { B }
}

if fundomain.com {
  namespace { A }
  namespace { C }
}

Is there a way to achieve this?

Thanks, Ralph