Nice! Sounds like we already have many features from their Advanced Diplomacy concept: The three Enemy / Neutral / Ally states always existed in 0AD. While you can't put time limits on them or restrictions just on economic activities, you can always break away... in recent versions I've had AI break neutrality pacts and go back to enemy, thankfully not alliances which would be more difficult on players. You can even send resources to your enemies, always wondered if that makes AI more likely to