Load/Enable this mod to disable the spawning of enemy bases and trees on NEWLY GENERATED chunks. Unloading/Disabling this mod restores the generation. This way you can go mega without having to use lua commands (=losing achievements) or restart the game, but prevent new spawners from being created. Existing enemies may still expand on their own!
WARNING: Usually the game generates a few more chunks than what the player sees and enemies may already have been generated and exist on chunks not yet discovered by the player and may expand on their own.
Due to factorio's design, changing the generation of enemies requires a game restart. Therefore I decided against providing a single startup-setting as it would be as effective as not loading this mod at all. inspired by RSO's disable vanilla biter generation.