[Dovecot] Folder layout after Cyrus to Dovecot migration

# dovecot --version 1.2.15

We're trying to migrate a server from Cyrus to Dovecot, and we're mostly there.

On Cyrus, the folder layout in the MUA is:

INBOX subfolder subfolder ... Sent Drafts Queue Trash

Users cannot create sibling folders to the Inbox, only subfolders (and sub-subfolders, etc). We've replicated that with:

mail_location = maildir:/shared/imapmail/users/%u:INBOX=/shared/imapmail/users/%u:LAYOUT=fs

namespace private { separator = / prefix = "INBOX/" inbox = yes }

...however, the Sent/Drafts/Queue/Trash folders are now subfolders of Inbox. Cyrus seems to default to the above layout (at least, I can't find anywhere that defines it). There are no special settings in the MUA to achieve the abovev. Is there a way of replicating the above within Dovecot? We can probably go to V2 if we have to, but 1.2.15 would be preferable.

Thanks, Keith