Wikimedia Phabricator allows users to log in using Wikimedia SUL (MediaWiki OAuth plugin, good for 99,9% of Wikimedia users) and Wikitech/Labs/Gerrit (LDAP login, good for 0.1% of Wikimedia users, and a good backup just in case OAuth is down).
By default, Phabricator will feature a full-fledged LDAP form first, adding the MediaWiki button underneath. This is confusing users, who enter their Wikimedia credentials in the LDAP form. They have no clue what LDAP is, and they simply see the familiar shape of a login form.
This problem would be solved if we find a way to hide that form behind a text link. Such link doesn't even need to be prominent, it can be placed in the text description (preferred) or be just a floating text label. This would give to the MediaWiki button the prominence it requires, even hesitant users would click it due to the lack of apparent choices, and most of the login problems would be gone.
@mmodell, whenever you have time, could you post an initial assessment of the realistic options here, please? I'm happy to submit requests upstream if needed, although I'm not sure what would be upstreameable here. Having LDAP login behind a button is a possibility too, if this would be indeed something that upstream would be happier to integrate.
