I think that races that agree to an alliance must be forced to go to war with any civilization that the other ally declares war on or has war declared upon them. This was sort of the case in Galactic Civilizations I and Alterian Prophecy, but I would like to see this in Twilight of the Arnor. It can be a seperate agreement to just an alliance, or built into a regular alliance, but I would really like to see alliances become more then just "ok, now I have an alliance, but my allies don't do anything" type of deal. I want allies more involved, especially the AI. Human players can still, and should be able to make a decision if they want to join their Allies in war, but I want alliances to be more involved.