Hi!
I really, really like this mod, but:
I play with overhauls.
So, my question here is.. I'd like to be able to play this with the AI changes disabled. So that the evolution into different types of biters would happen, but the attacks would only be triggered in vanilla way.
Is it enough to just switch off Raids and underground raids and what not in the settings to achieve that?
I'm ok (moreso, I actually like) the expansion changes, but the changes to attack patterns/changes make the experience unpleasant for me.

This is not enough
You need also:
AI: Enable Siege AI - disable
AI: Action points scaling set to 0
AI: Difficulty - set to "lite" - This will weaken counterattacks after nests are destroyed, although it will not eliminate them completely

In this case, as long as you don't attack the nests, you will fight against the standard AI. After destroying a large number of nests, you will have to withstand a counterattack for some time.

Thank you. Counterattacks is fine, unprovoked attacks out of nowhere I can't handle.

Took some fine tuning but what worked:
Disabling Attack Wave, Raiding AI, Siege AI, Underground Attacks.
Setting Action points to 0 disables attacks too.
However, there will be no expansion (Vanilla nor Rampant) as neither Aggresive nor Growing AI state gets points so there are no expanding parties.
To keep expansion, enable Migration and set settlement probability to 1 and set Action points to the difficulty you desire (more action points means faster expansion).
AI will switch to Migrating mode creating only migrate squads covering the whole map. It's not Vanilla expansion but it works and you get all the special enemies.

thanks Methes!