[Dovecot] lazy_expunge questions

[James Devine]

I'm messing around with lazy expunge and I just had a couple of questions.

If I delete messages or folders with messages, I see them being moved to
the expunge namespace, but if I delete an empty folder, all traces of it
seem to disappear.  Is there a way to move empty folders to the expunge
namespace also?

My second question is in regards to restoring folders.  If I try to execute
the imap command 'RENAME EXPUNGED/TEST INBOX/TEST' I get 'NO [CANNOT] Can't
rename mailboxes to/from expunge namespace'.  Just wondering if this is
possible or do I need to recreate the folder and then move messages into it.