Yes - for internal scenes I generally use the black atmosphere, turn off fog and haze, and delete the sun. This is with the standard lighting model. Now I'll add a point light so I can see what I'm doing. Now I will go into the atmosphere editor (declining the offer to create a new sun) and the lighting page. Change the sunlight/ambient balance to 80% sunlight. The lighting of all objects in the scene now goes down, despite the fact that "apply only to sun" is selected and there is no sun. I'm used to this by now, but it's weird all the same.