I use r.SceneColorFringe.Max=0 as well in my engie.ini file, but I'm not actually sure it does anything, but to be honest I never saw a difference between using / not using CA in AC1 either.
My engine.ini looks like this:
[/Script/Engine.RendererSettings]
r.BloomQuality=0
r.LensFlareQuality=0
r.DepthOfFieldQuality=0
r.SceneColorFringe.Max=0