[Dovecot] Two-phase delete/expunge ?

Is it possible to have messages which have been marked for deletion or which are to be expunged, moved into a "secret" directory on the IMAP server? The IMAP client would consider the message as deleted, but an administrator could easily restore single messages (without having to retrieve tapes) by moving the message back into inbox.

I understand there are patches floating around somewhere enabling that for Cyrus, but I'd love to see Dovecot do that as well. Is anyone aware of such functionality?

Thanks, -JP