Right now volumetric fog replaces ‘Fog Inscattering Color’ within the Volumetric Fog View Distance. We might change this in the future. It’s pretty much impossible to get them to match up at the ViewDistance transition, because they are two completely different techniques.
I don’t fully understand this question. The skylight affects volumetric fog which gives an ambient term.
I haven’t figured out how that should work yet =) Source Radius doesn’t actually affect the energy emitted by our lights. I think I will end up changing the way SourceRadius works for surfaces vs Volumetrics.
You can already change a single light’s intensity on the fog with VolumetricScatteringIntensity.