This thread has inspired me.
I have been modding in multiple [CREATURE:HUMAN] entities for a while now. I now realize that I must give them all true Position tokens, and their power must be able to be usurped by conquering civs. No longer will they all just be warlords and kings, appointed and never questioned. No. I am going to make their power structures complete. And all the way to the highest corridors of power, there must be positions with the [CONQUERED_SITE] token. This will allow civilizations to be conquered, instead of merely raided until the end of time.
So far I have a few entities:
Roman - Based on the Keepers from Genesis and using the Latin language file.
Nordic - Based on the Nords, and thereby the conquering Gothic tribes. Using Finnish as their language (because nobody has come forward with a German language file)
Arabian - Taken wholesale, so far, from the Ezrakim.
Asian - From Genesis's Orcs, only human. Still waiting for the language file.
So far they coexist, and occasionally a city will become overrun by members of a different race, since they all [LIKES_SITE:CITY]. This only changes their culture and language. With the addition of positions of power that can by usurped, once these cultures go to war with each other, the actual ownership of the cities will begin to switch.
The outcome of this, I predict, will be quite a lot of wars between the humans. Placed in a normal game, this will mean there will be 4 times the amount of humans. It also means 4 times the amount of dead humans. This should balance them out a bit, and prevent them from overtaking the entire world, since they will be fighting for dominance amongst themselves.
This is actually very close to what happens in most fantasy worlds. The Elves and Dwarves stand idly by while the short lived races fight for dominance. These elder races will be made more powerful, but much less aggressive and warlike, as a result. I forsee that it will be entirely possible that humans may kill each other off in such numbers that in an old-world gen, the elves and dwarves (bitter enemies of course) will be left as inheritors of the entire world.
If all goes well, and I get permission to release the raws from Deon (they will be heavilly modded, of course), I may even release this as a mod. Installing it into Genesis will require removal of some of the races Deon has added... but adding it into the vanilla game will be as easy as deleting [ENTITY:PLAINS] and dropping in entity_humans.txt.
Wish me luck, and much !!FUN!!