The means by which the game combats you in single-player or instant-action mode is by using what is referred to as "artificial intelligence". Modifying the artificial intelligence to work with what you want it to do means knowing how to make it work. Doing it right is among the most challenging and most rewarding modding you can do in A2.

Artificial Intelligence and You
Freyr's thoughts : Strategy vs Cheating
Freyr's thoughts : Personality Parameters
Freyr's thoughts : Random points