Anybody know? I'd like to know as well. My custom race is supposed to have a Blue home star, and I'd like to know how to change it.
While we're at it, anybody know how to name the other starting planets and not just base them on the name of the home planet?
Don't know about changing star colors. Looks like Marvin has that covered. Changing planet names is easy, though. Just look at the other custom star systems to see the tags used to designate the planet name. Just put those tags into your custom system with your custom names and you're good.
I'm not sure how to change star colors, but it's possible to edit the names of the home planets from the Data/English/CustomPlanets file. As far as I know though, it's not possible to make these changes for a custom race unless you edit them into the game to replace another default race, as the CustomPlanets file only covers the 12 default races. More experienced modders, do let me know if I'm wrong!
You can add more custom systems to the CustomPlanets xml. I find it easiest to just cut-n-paste an existing one then edit to my desires. For anyone confused about planet size, texture, etc, it's nice to know that values will be randomly assigned if you don't specify them. So let's say you cut-n-paste Drengi, for example, but don't want a clone of the Drengin home system. You can just change the planet names and delete all the texture, size, and other tags to get random values - instant custom system. That way you can use your custom systems until you figure out more about the textures and such. Also, planets can have either rings or a moon, but not both.