'disabledoveadm' should be 'n'
I have finally tracked down source of a long-standing annoyance in our dovecot maintenance jobs, printing 'User no longer exists, skipping' errors for some accounts.
There is a 'disabledoveadm' field of mail_user, which is set (in interface/web/mail/mail_user_edit.php) to the same value as 'disableimap' - this means that if you disable IMAP for a mailbox (eg. for a pop3-only mailbox), you can no longer manage the mailbox from cli with doveadm.
I don't know of any reason that a valid mailbox should not be administerable via doveadm, and will propose that disabledoveadm always be set to 'n'.