Not much. Especially in regards to combat AI.
There are some values to adjust how fast AI makes checks on various things and how it reacts, but it all includes mainly collision, general movement and weapon choices.
As for the strategic - there are ways to influence some choices by costs and tech requirements. This is not much though and is not really directly linked to AI.
Yeah, i`m glad to be back into modding SOTS once again. In those many years since i started and finished the first mod of mine for SOTS - i graduated, married, got two kids one of which is now at school!
And still as you said - there is nothing out there that is equal or even close to SOTS. Even Stellaris with its overdosed variety of choices and stuff is not that inspiring as SOTS.
As for the mod`s playable version - it will take a while. I`m progressing way too slowly. The pace is around 3 models + textures for them in 2 weeks. And to cover at least DEs for a single faction i need 45 such models (each one is a section).
Rough estimates are summer. Around this time i might have 2-3 factions ready.
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I would like to ask for some assistance since there is smth i can`t do myself for this mod. I need voice actors!
Since all the factions in the mod are humans and vanilla`s are aliens with unique accents and traditions inspired phrases - i need people to record all of the phrases for each faction. Probably also a person to write these down in a proper way.