Homeworlds can only be accessed with custom races; when you are picking the abilities, there is part where you name your homeworld and pick the system it is in. This MOD doesn't do anything with homeworlds, but I have another MOD that adds 2 new Homeworld systems. But to change the homeworld systems, you need to use a custom race. I have a MOD that adds a couple of overpowered homeworld system if you want to take a look at it. It adds a system with a single class 60 home world (called the Techlab system), and a system with a class 50 homeworld and (7) class 30 worlds (called the Christo system) that can be colonized. Here's the address for that MOD if you're interested: https://www.nexusmods.com/galacticcivilizations4supernova/mods/8
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https://www.nexusmods.com/galacticcivilizations4supernova/mods/8