At least that I know of, there's no realistic support for binary systems. Sure you can just put an invisible object in the middle, but that isn't really accurate. So why not add binary object support? There are plenty of stars, planets, and asteroids that are in binary systems, so this would be a useful feature for the Planet Editor. Yes, having planets and spacecraft orbit the system might be complicated, but I think it could be done, since there are planets that orbit binary systems.
