- Mines: You can only have them on one of your province's roads, they deal the most damage to infantry and tanks and are quite expensive. maybe uses metal and gas
- Coalition loyalty: there isnt much of a difference between coalitions and just sharing map with 5 people, people can leave the coalition and attack you jsut the same. So to make coalitions more meaningful i think that when a coalition country gets attacked, all the other members automatically declare war
-Puppet states: when you really only want maybe 4 provinces from a country and you dont want to conquer it all, or with AI that once youre at war it takes forever to change to peace, you should be able to send a trade offer in which it is puppet state, it can revolt, it has taxes to you, shared intelligence and it cannot join coalitions
idk if theyre even possible but sound like fun
