Is it possible to have some non-national units that aren't aggressive barbarians (like the workers scattering)?
This brings up the idea for having neutral units (not to many, just representational amount), like non-violent or affiliated animals.
How about non -country created or allegiant units with financial, religious, diplomatic, exploratory, development (resource seeking) motivations?
I love a bit more 'Living World' (non-determined) stuff in the game to spice up the environment, and vary up outcomes. Like the barbarians, and animals, I think guilds and corporation units should be spawned and exhibit behavior Outside of what is determined by a civilization. Corporations and Guilds, operate across borders and can have operations and strategic interests in several countries simultaneously.
Ever see trader units respond and flee to other countries when there is a war declared?
Ever see a truck or trader unit get created by a corporation and travel between cities?
Ever see a religion try to spread it's own religion by sending out missionaries?
Ever see modern animals spawn much in modern times? (In both Atlanta and Dallas, an occasional bear, coyote/wolf, harmless rabbit, or rarer animal encounter wanders into neighborhoods; Gators in Florida and Louisiana. It is a problem in some places.)
Trade route connections could be shown that way. You could keep it represented by just 1 unit going back and forth along a trade route.
Guilds (just build that resource), Businesses(just launch that idea) , Corporations (just make money), even Religions (just spread it) could represent their own interests.
The same could go for non-aligned travelers, explorers, missionaries (can some of them they have their own agenda for their religion?). You could just have a random (non-built) explorer, missionary, trader just randomly pop up and do it's thing every now and then.
I would like the occasional unit to move themselves and have motivations other than attacking.
It is all breathing (instead of static) behavior. Some, but not to much, would make the game interesting.