What the heck are you talking about ?
You can't edit humans before entering the world.

Like randomizing their stats and appearance

that is entirely possible with aliens as well.

You can edit humans before entering the world. It's called the most popular mod on the workshop, Prepare Carefully.

It isn't the most popular, by a long shot. But well.. that is not what rubber_duck was describing anyway. Also... if you want prepare carefully to support this mod, ask on the page of prepare carefully

Okay, what you've made here is great. I want to preface my statement with that.

But it is the most subscribed mod in the entirety of Rimworld. Period. The end. EdB Prepare Carefully is THE most installed mod. Period. You can check it yourself.

This isn't incompatible with it by any means. But it does have a strange problems with other race mods, in that skin color seems unchangable. Not sure why, doubt it's your problem.

Check the steam subscription ranking, it doesn't rank correctly. But yes it is popular.
And yeah, I don't really give a damn about prepare carefully. I personally don't use it and the author is extremely distant from the entire modding community.

I had compatibility patches at some point included in alien race, but he decided to instead make his own compatibility patches in prepare carefully, so I pulled mine. My structure regarding skincolors didn't change since 2.0 released, so I don't know why his compatiblity patches aren't dealing with that.

To recap, edb took compatiblity on himself, so if something is missing for you, feel free to ask him.