Currently there's no way for players to give any kind of commands or hints to AI demigods.  Multiple AIs can team up to some extent, but if a player wants to take advantage of e.g. an AI Sedna's heals, he has to follow the AI around.  To remedy this, I suggest that players could set goals for the AI, like mark towers that should be destroyed, flags that should be captured, or request support in pushing towards the enemy Citadel.  Any nearby AIs that consider themselves to be free could then pick up one of these goals and attempt to carry it out.  The markers could even be displayed to other players in the same team as a method of conveying plans to others.