The process isn't too difficult. Just check this scenario's files and the changes it made, then replicate those changes to other scenarios for the same files. You can even merge them but that can cause issues some times. I use notepad++ to search and replace. Makes it easy.

Yeah, it is possible.

I wonder if this change can be applied to other custom scenarios like Reforged Eden? Can it be possible? I am not asking you to do it, maybe give an insight if it's possible and how to modify the POIs and World :D This is already amazing to enjoy the vanilla game!

The only thing I replaced was spiders, so you may just not be seeing the bugs.
I spawned all of the IDs I used to check and make sure, too.

After playin for 2 nights I've not seen one yet, just big raptors :) You've saved this game for me!
So far I haven't been seeing the little alien bugs tho?

Hope it works out well for you. :)

You're wonderful! I'm keen to try it out.