I just thought I would throw this out there to get your input for the next big EU4 game. I pulled the rules from RedIt

EU4 War and Diplomacy:
* If Player has 95% warscore on you must accept the peace deal( If you are losing 95% war is lost, this rule is to avoid useless time wasting besieging cities) !
* Player can't offer a peace deal that is over 100% warscore.
* No Pausing during the wars against players (does not apply when you trying to get a peace deal) , only short pauses against the ai so it would not get any more warscore when you try to peace out. (only game master can pause the game if there is any problems)
* No forming new alliances to send Call to Arms into PvP wars after they have already started 6 month ago.
* You can only gift no more than 200 duckets every 4 months, to avoid sending free money to people, you can also use loan or subsidies function
* You can't form larger than 3 player coalition, people from other continent that have nothing to do or help in any way can't join coalitions, if you join coalition and instantly declare war, that can cause problems and result into a ban.

Game Rules:
* No selling land without a reason and explanation, this can be a quite serious issue that people not like.
* No mass Sabotaging - Releasing all your vassals, getting bankrupt and disbanding all armies, before leaving the game.
* If there is banned nations you have to follow that rule. (so far only France is on this list)


Again, this is just an idea I've been thinking about. By no means something we have to follow.