Hello Puttness,
Sorry for the late reply, but hopefully you managed to sort things out somehow already.
So, as long as you have disabled and enabled biter generation through this mod (and not some other one), things should "go back to normal" - the mod stores internally the previous state for spawning bases and restores the relevant values.
If you have used some other method to disable base generation, or have uninstalled Biter Remover after disabling biter generation, you might be out of luck (game is pretty good at cleaning up data etc from uninstalled mods - both a blessing and curse sometimes).
Best regards,
Branko