Purge trash and junk on mdboxes in Dovecot

Looking at !1015 (merged) we have purge trash and junk only for maildirs: /server/lib/classes/cron.d/500-clean_mailboxes.inc.php I would like to suggest adding also purge for mdbox'es. This topic has been touches in this discussion: https://www.howtoforge.com/community/threads/email-cleanup.80522/ doveadm expunge -u user@domain ... some_criteria

Also it would be nice to have the frame setting for purges also inherited: global, per domain, and per user (that last one exists).