I think that it would e cool if eclipses not only blocked out the sun, but actually cast a shadow visible from orbit and the surface. This would be much more realistic that what happens currently. One way of doing this is that every planet and moon could have some cone of darkness that points exactly in the opposite direction of the sun at all times. When this falls onto an object, it could apply the correct amount of dimming to it, as well as a certain pattern, being that the shadow gradually disappears as it reaches the edge of the covered area. This would even enable players to view planets transiting the sun.