Is there a reason why Capella B is being permanently obscured, other than the fact that having Capella as a double giant star would deviate from canon? Everything that I have been doing so far is deviating from canon, so I really don't see the need to hide Capella B. I don't think Volition cared too much about getting the astronomy correct for FS, otherwise our work would have been done: stars would be represented with their correct colors and luminosities, multiple star systems would be correctly respresented such as Sirius and Antares, planets would exist in the correct circumstellar habitable zone, and so on.
I really don't understand why Volition took the time to use real stars to represent their universe, but didn't take the extra time to make those stars at least a little similar to their real-life counterparts. Sirius doesn't have its companion in FS2, Antares and Betelgeuse aren't supergiants (let alone red supergiants), and our famous Capella is not a double giant star, just to name a few. So if we can correct Betelgeuse and Antares, and give Sirius A its white dwarf, why not give Capella A its large companion?
This might be because the numerous animations don't mention or portray another stellar companion to Capella. First, FS and FS2 never mention accurate details of any star, visually or verbally. The only thing the games got right was fairly accurate pronunciation. Referring to the animations, if we go with the idea of making the in-game scenery more like what we see in the animations, then several changes have to be made: less nebulae, more planets in Capella, Capella has to be infinitesimal in size compared to any real star, and so on. I know that none of these changes are wanted, so why make Capella B hidden just because it's not shown in the animations?
*explaining myself about Capella's animation size*
IIRC, command states there are hundreds of Sathanus juggernauts surrounding the Capella. I don't remember if it was hundreds, thousands, or millions but let's go with hundreds for now. Lets say an SJ Sathanus is about 2.5 km wide and about 2 km away from the nearest Sathanus. Let's assume that they are in a straight line, forming a large circle. If Capella A was the same size as the Sun, it would have a circumference of ~4,373,097 km. If this is true, there would have to be 971,799 Sathanus juggernauts encircling Capella. This is already way off
commands calculations of hundreds or even thousands of Shivan juggernauts. If there was no space in between the juggernauts, then we would have 1,749,239 Shivan juggernauts. This is assuming that the juggernauts formed their circle on the surface of Capella, which we know did not happen since the juggernauts would have been obviously destroyed and this is not depicted in the animation. So let's say the Juggernauts are Mercury's distance away from Capella's surface (which is still Sun-sized) at a little more than 1/3 AU. With the 2 km spacing, we would have to have 82,024,890 juggernauts in line; Without the spacing we would have 147,644,802 juggernauts. The problem is we know that the juggernauts are not lined up in this manner, and that Capella A is 10 times larger than the Sun. We would need a helluva lot more juggernauts to make one complete circle around the giant, at a suitable distance away that would not destroy the juggernauts in the process. Assuming a Sathanus could survive being 1/3 AU away from Capella, the giant star would appear huge in the sky at this distance, more than 14 times the angular diameter of the Sun.... maybe the juggernauts are even further out than 1/3 AU, but that would mean more juggernauts to complete the circle. Therefore either the juggernauts are very humongous, or Capella is extremely tiny.
As for the size of the in-game stars, I think they should be much bigger. Betelgeuse looked great in your screenshot, but I think all of the others are too small. Stars with companions are also too dim. The situation with Capella C and D is fine, because not only are they dim red dwarfs, but they are extremely far away from Capella A and B. The calculations I made would give the pair of red dwarfs an apparent magnitude from Capella A and B no brighter than that of a normal skybox star. I would still like them to be a little noticeable since I did take the time to make them. But in the case of Polaris Ab and B (I don't even see B in the screenshot unless Ab is the bright center of the nebula and B is the little speck in the corner of the nebula), they appear to be too dim. With Polaris Ab being 7000 times brighter than a full Moon, no one should have any problems locating it, the same goes for Polaris B which is only 40% as bright as a full Moon and much brighter than the brightest star in the sky.
Back to the proper stars, here's the same shot that I found from an older 3.6.8 thread:
This is the original image, no zooming or cropping. The sizes of the stars here look perfectly fine, so I believe its ok to increase the current stars' radii to make the hues and details more visible.