[wp-trac] [WordPress Trac] #14988: Site admins should be allowed to add existing users without also enabling creation

[WordPress Trac]

#14988: Site admins should be allowed to add existing users without also enabling
creation
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 Reporter:  nacin        |       Owner:     
     Type:  enhancement  |      Status:  new
 Priority:  normal       |   Milestone:  3.1
Component:  Multisite    |     Version:     
 Severity:  normal       |    Keywords:     
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 Blog admins are allowed to add users to their multisite blog when the "add
 new users" network setting is turned on.

 Unfortunately this allows them to both add existing users, and create new
 users. There should be a way, potentially just with a filter versus an
 option, to limit that to only add existing users, and prevent the creation
 of new users without going through the public registration process.

 Use case: WordPress.com does exactly this.

 Alternative use case: WordPress.org uses a pretty crazy SSO setup. We
 should not be allowed to create new users through the admin, but it would
 be very helpful.

 Real world use case: Any blogging network like WordPress.com, or crazy
 synchronized login system like WordPress.org, would want this.

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Ticket URL: <http://core.trac.wordpress.org/ticket/14988>
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