[Dovecot] Global fields for passwd-file database

[Sergey Urushkin]

Is there a way to specify global fields for passwd-file DB? Currently
interested in "home" for userdb and "allow_nets" for passworddb.
The next doesn't work, of course:

passdb passwd-file {
    args = username_format=%n allow_nets=127.0.0.1
/etc/dovecot/dovecot.passwd.%d
  }
userdb passwd-file {
    args = username_format=%n home=/var/mail/%d/%n
/etc/dovecot/dovecot.passwd.%d
  }

-- 
Best regards,
Sergey Urushkin