retrocity5, I think your question shouldn't really be one for this modder but a thought for the whole sim community. The truth is, whatever we add could end up being replicated somehow either by DLC or other mods. Heck, my first mod (which is likely to take a looong time) is a civilization called Yorkshire (the county/ies I grew up in England - a jocularly arrogant bunch who are kind of England's Texas) with the Leader Duchess Flatcapp, the unit Tyke, and the district/improvement Ilkla Moor. There should be no way in hell any of that will crop up in anyone else's work because duh, but that doesn't mean it won't...