createa a half-dome for sky with your atmospheric scatterer, and sphere-map a star-texture which you blend with enviroment depending on daylight level
i do it, and it works ok.. it's not a perfect spheremapping, and it never will be, because im cheap on the number of vertices
(and it converges on top/bottom, depending on your rotations)
i guess it's because im a programmer that i won't notice such things
maybe an artist would
EDIT: oops, i guess you are creating google stars?