I'm thrilled you shared your discoveries!
I tried to create a greater number of Nebulae & Clusters than normal with this Mod.
Here are the two galaxies showing the Red, Blue and Green channels with a little more contrast. The Alpha Channels are shown too. I don't think these actually have any influence on the generation of the Star Systems, so the close binary planets you showed are just a statistical fluke.
Space Engine creates the procedural diffuse nebulae with the red channel, open star clusters with the green channel and the young blue stars from the blue channel. The Alpha Channel in the PNG files is for Dust and other Nebulae I believe. I'm not really sure lol