Playing a few skirmish games to test practice builds, I have come to find that the AI fully ignore the Running Silent stance. If the AI has a fleet with Nova Cannons, then they are shooting Nova Cannon shots directly on top of you. Though you are suppose to be invisible to your enemies. Some fleets will act for a moment that they do not know where you are at, but if you move to close (still out of range for them to even detect you) they just magically know you are there and move directly to you. Found this out trying to create a stealth build and realized very quickly that I couldn't play a skirmish withou confrontation, because the AI has access to my information when making its decisions and it shouldn't.