Hey there @Architect3d, I’ll try to hit these in order:
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that’s odd that the moon light had no shadow casting, as it should be activated in the light actor that you assign to it by default. I can add it in as a parameter within Orbit’s variable list.
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something to keep in mind with the changing lighting in Orbit (including ambient lighting) is that a fair amount of balancing needs to be done between the lighting levels at different day times, and the auto-exposure pp effect if you’re using it. I’ve found that checking my auto-exposure settings at sunrise, noon, sunset and night time to ensure that the exposure levels are what I want them to be. Disabling auto-exposure helps make setup easier, but can cause a decline in visual flare, depending on what kind of style you’re going for.
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The cloud lighting levels should be tied to the time of day as well, if you crank up the lighting intensity and then try changing the colors, can you see any difference?
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Volumetric fog requires either a high-density level or high-intensity lights to be visualized. I’ll have a look at the code to ensure that the sun position isn’t affecting the density/color levels if the automation option is disabled, as that may be causing the fog to not be rendered at night.
I can look into separating the blueprints, though this will take a lot of re-writing, though this is something that is occurring anyway as I’m looking into implementing more volumetric cloud options that better suit games where the camera enters cloudspace.
I intend to create a tutorial video series, though I haven’t had much time recently to sit down and put it together. I just finished setting up my office space so I will have time to work on this now, and I’ll be creating videos dedicated to section-specific tutorials, as well as content examples and even customization options.
I thought I had filled out the tooltips on everything, I’ll go back when I get home from work and double-check them. I agree, having these is a given and is something I’ll address asap.
Thank you so much for your time and feedback, I’ll begin looking into these topics and have some solutions soon. 
Cheers!