[Puke]

the AI will avoid attacking non-combattant ships if it can instead engage a military target. you can unleash some real cheese if you then use those non-com ships to blocade things, the AI will never go through. the WP. same goes for simultanious movement. a human crippled my colony ship at a warp point with an escort as we made first contact. the colony ship stayed there engineless, and none of their ships would go through the warp point. so he lost 4 or 5 turns before he figured it out and send a military ship with explicit 'attack' orders to clear the warp point.