co-existence to a point

[SirJMO]

TL;DR

The re-action of the biters is not in proportion to the initial action, before re-assessment.

What ?

Only having the biters start to evolve and expand after the pollution touches them (first attack trigger) or they get attacked.
Ideally have the expansion modified/multiplied by the evolution factor, so the more evolution the more expansion.

Why ?

I think the biters have no reason to start growing(innovate/evolve) before there's a substantial threat in the form of pollution or an assault on their base to warrant doing so...
Nor to expand and increase the amount of nests when they had so much time before you (crash)landed on nauvis until they have the reason like to try and box in the threat that is the engineer and their polluting dangerous factory.
In short I do not think a object (the ship) impacting the planet is significant enough to warrant immediate action to the hivemind who is practically everywhere on the planet.
There's options to change biter evolution rates and expansion rates, but those are static throughout the game.

Why here?

because I think it has a higher chance of being created as a mod, rather than implemented in the basegame (even as an option)
I don't think I have the skills to implement this properly with my current experience.

[Silari]

Ideally have the expansion modified/multiplied by the evolution factor, so the more evolution the more expansion.

Per the wiki, the time between expansions already averages lower with larger expansions as evolution increases.

The interval between enemy expansions is global, and the higher enemy evolution, the shorter the interval is on average. Furthermore, with higher evolution, the groups are bigger on average.

[FuryoftheStars]

Only having the biters start to evolve […] after the pollution touches them (first attack trigger) or they get attacked.

And this is achieved by setting the time related slider to 0.

[SirJMO]

And this is achieved by setting the time related slider to 0.

actually untrue, evolution starts as soon as you produce pollution, not as it gets consumed.

Per the wiki, the time between expansions already averages lower with larger expansions as evolution increases.

The interval between enemy expansions is global, and the higher enemy evolution, the shorter the interval is on average. Furthermore, with higher evolution, the groups are bigger on average.

whilst this somewhat solves part 2 of my idea it doesn't touch part 1 below.

Only having the biters start to evolve and expand after the pollution touches them (first attack trigger) or they get attacked.

[FuryoftheStars]

And this is achieved by setting the time related slider to 0.

actually untrue, evolution starts as soon as you produce pollution, not as it gets consumed.

Right, forgot they have it base on production, not consumption.

In that case, have you tried out Rampant Evolution?

[SirJMO]

that seems as close as I'm going to get.