For anyone looking, the mod currently raises the chance to 90% despite what the description says.

I don't think you can directly?
The best way to do this would be to have your Custom Empires only "always\force spawn", and have more Custom Empires than you do AI Empires in your game.

how do you make it to where all custom empires spawn instead of random ones?

Not that anyone probably cares at this point, but I've just updated this for v2.6.2 (Federations)

I didn't actually change anything, because as far as I can tell it's still the same.
So I just updated the file and the version compatibility text.

I haven't even tested it honestly, but I'll try soon. Let me know if you think its not working :)

I tried recreating the mod myself (it couldn't be any easier to do.) I don't believe it is possible to make this Ironman Compatible, but then again I don't know much about modding. The file that this needs to modify is a part of the Ironman checksum.

Hey InvocK.
Appreciate the support.
Unfortunately I haven't played Stellaris for many months, let alone looked at this mod.

There's the possibility I might update it in the future, but don't even have Stellaris installed right now.
This mod was really really simple, so I'm hoping someone else could just update it to be compatible with the latest version and take it over?

The details are literally in the description for anyone to copy.

Hey, I'm one of those guys that use and love your mod. Sadly, it stopped being ironman/achievement compatible with 2.1 (checksum modified). Could you take a look into this? That would be much appreciated!

haha, wow! Blast from the past. Haven't played Stellaris in awhile. Glad someone else is making use of it!

thanks for this!