Are you thinking about adding an economy to the game? For example, being in debt would increase revolt change. The higher gold and income the higher armies you can have. You can send aid to your allies gold if they are at war or in debt and the maximum aid is 500. Being in debt more than 1000 gold means you cant have an army ( it is so you can increase your income and get out of debt. This does not apply if you are at war.).Hope you like my sugggestions!