OK I was trying to control Rampant expansion in the late game. Because it expands like 10 times per minute or more and settles every free chunk very quickly. In ~1 minute it settles all free chunks when I reveal/generate the chunks. Reveal chunk -> in 1 minute it is settled.
After some testing I think I figured some things out. Would be cool to confirm/correct from the mod author.
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Attack AI does respect peaceful setting. It does not generate raid parties.
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When attack parties are generated, if they are not killed, they settle. This sometimes happened to me too even when Migration and Siege AI is disabled. I.e. it is a separate mechanic. I could not stop it from happening. Every attack or vengeance party can do that.
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When artillery kills a nest, Rampant creates a settlement party immediately. When I kill a settlement (10 nests) it generates 10 settlement parties. This was the primary source of my problem, I think. Artillery kills them constantly, and rampant keeps re-expanding every second because of that. The issue is that killing one settlement creates 10 settler parties, because there are many nests in one settlement. It multiplies settlements exponentially.
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Migration AI and Siege AI do respect being disabled. They do not generate settlement parties passively anymore.
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However, it does not stop nest destruction response settlement parties from being generated! In fact, I could not find any way for stopping them at all.