Add an option to disable by default for logged-in users

Soft-depends on I90f6ab5b44fbcde0b89f56e795f69472c4940854

Bug: 69363
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/822
Change-Id: Ief0df5b4f4285d99208f007b0510a396f6c272e0