muc/sub-ejabberd 16.12 beta

Hi,how to admin, owner or member adds Subscriber to group?
add myself(u1) to group as Subscriber:

<iq from='u1@domain.com'
    to='group1@conference.domain.com'
    type='set'
    id='E6E10350-76CF-40C6-B91B-1EA08C332FC7'>
  <subscribe xmlns='urn:xmpp:mucsub:0'
             nick='u1'>
    <event node='urn:xmpp:mucsub:nodes:messages' />
  </subscribe>
</iq>

but I want to set muc's config with "member_only: true" and others can add subscribers to group. how do that?
in muc, admin or owner can invite another to group:

<message to='g27@conference.domain.com'>
  <x xmlns='http://jabber.org/protocol/muc#user'>
    <invite to='user2@domain.com'/>
  </x>
</message>

Not possible, because the

Not possible, because the protocol and the code do not support to invite to subscriptions.

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