The game actually provides base numbers, which no one will totally agree with so its probably a forever discussion on where they should be set it.
But CoE3 also provides (unlike Dom3) working Scenario commands. So downloadable maps can have full storyline scenarios and campaigns. There are maps which create more resources, or less resources. Some which provide more magic items scattered across the map. And some which can give the player extra gold/iron/whatever at the start of the game. Or extra units if you feel its needed (like giving the Senator some War Elephants)
You can also create campaigns, quests with rewards, DnD situations, and mid-game worldwide events.
AND with the next patch we should start seeing modded nations. Time to browse thru the Dom3 mods for crossover ideas.
http://www.llamaserver.net/globu/Dom...neralMods.html