I never met such lines in the gameinfo folder, and I think there is no way to say which specific ships to build (by specify which ships to build, I mean specify the frigateRoleType the AI should build). I never saw a whole AI code, but I'm sure that is so complex, with many variables and with many if-then causality, this is propably hundred, unless thousand lines and commands.
So, I think that's why I never met with exact ships or roletypes commands for the AI in the gameinfo folder. And maybe that's why there isn't big buzz in this post. I'm sorry that I can't help, the AI is the developers' business... it's beyond us 
I hope I'm wrong and someone will corret me, I have problem with the AI's choices too, as in all strategic games.
Thank God for the multiplayer games! 
neterw