I've modified my main game to add three civs, with leaders using these traits. I used the Colonization assets and split up the Native Americans and made Gran Colombia. Currently, Mangas Coloradas of the Apache is Pro/Org, Hiawatha of the Iroquois is Ind/Phi, and Simon Bolivar is Cre/Cha.
The Ind/Phi is powerful, but not as much as you might think. If you have an aggressive neighbor than life can get really difficult because your big edge is in peaceful building, and few things are stupider than building wonder after wonder in an increasingly attractive city while Shaka is building maceman after maceman. Still, it can work out really well, but I still think Rome under Augustus is way more powerful, especially with Praets and Forums.
I've played with all three and against all three, and they work great. If I can finish my minimalist mod one day I'll spread the love. My mod is pretty small, but I think it is high quality. It adds one wonder, the Pantheon (+2 Espionage per state religious building, requires construction and polytheism), and uses a movie from CivRome so it looks like the other wonder movies. It also tweaks a few things, like Spies move two and all civs have one of six ethnic artstyles until gunpowder era.
