Yeah Omni, it's not just the sun. The entire lighting would have to change dynamicly, as though you were in an environment with a 30 minute day or something. And from the perspective of Freespace, well, you're not in orbit very long.
I just think about games which do have rotation on their planets. The Armada games do, and it looks stupid (in fact, one Earth model, not sure if it's the normal or Borg variant, rotates backwards). Hegemonia has them too, but no one is going to call space in that game realistic-looking. Those are the only ones that come immediately to mind. If the planet in the background of the Halo title screen does, well it's a gas giant and that can be excused. But rocky planets should NEVER have visable rotation from a location where the sun is fixed in the sky, and that is the only way to look at it.