id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
14988	Site admins should be allowed to add existing users without also enabling creation	nacin		"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 to allow administrators to add users to a blog without going through the network admin (or asking a super admin).

Real world use case: Any blogging network like WordPress.com, or crazy synchronized login system like WordPress.org, would want this."	enhancement	new	normal	Future Release	Multisite		normal