Interiors of buildings are too brightly lit
When looking into a building from outside with no lights on inside it should be dark unless directly lit by sunlight/light source
When inside an underground space (the new N.W. bunker for example) there should be no light whatsoever.
You are missing a trick here in terms of immersion / suspense / spookiness, especially now you have managed to get infected lurking indoors and dynamic shadows.
cant you use the same dynamic shadow engine to render the sun light source now ?
If you can't implement this consider leaving it open for modders to do in the future