Dovecot 2.4 SETQUOTA, how to allow (admin) users to set quota (and write it back to LDAP)

Is it true that Dovecot dismissed the functionality of SETQUOTA with version 2.4.0 - without any replacement?
see https://dovecot.org/mailman3/archives/list/[email protected]/message/UYNR6GBP25XEGFCS633SWPR4HXV3NSS3/

Does this also applies to 2.4.2 and 2.4.3, or does the mechanism of plugin imap_quota returned (manual reads that there are no options to this plugin)?
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IMAP always replies `c008 NO [NOPERM] Permission denied (0.001 + 0.000 secs).`

If you can activate the former `quota_set` option, how to combine it with LDAP? I know that you can read Quota from LDAP with userdb field `quota_storage_size = {ldap:quotaBytes}B`. But how to set it?

I also remember an old opinion that writing LDAP is to slow, you should store quota e.g. in a text file and write it back to LDAP time shifted. That would be fine for me - however, how to enable SETQUOTA then? 

Thank you for help. 

--
Johannes Nohl
[email protected]
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