Well, I'm through with the game

[NTJedi]

quantum_mechani said:
And no, it is not currently possible (or likely in the future), to have a moddable AI.

Unfortunately this is true for Dominions_3.

Some moddable AI is available for recent games such as Neverwinter Nights(RPG) and for older games such as Warcraft_2(RTS)... both were successful and provided great new gameplay. I believe Age_of_Empires_2 also had some moddable AI options.

Some other good news is I emailed Stardock with a list of suggestions for their upcoming fantasy TBS game and they responded saying all my suggestions were already working or are planned to be implemented which includes modifying the AI via scripts.