feature suggestion: wildcard in userdb

aa:x:32009:32012::/home/usr/mail/bb::userdb_quota_rule=*:bytes=700M *:x:32009:32012::/home/usr/mail/bb:

That would be usefull in many situation, for example to set default values per domain (userdb per domain)

userdb { driver = passwd-file args = /usr/dovecot-cfg/userdb/%d }