One of the reasons I enjoy playing Civ games in general is to try to create alternate histories, mostly just to amuse myself and assuage the bitterness factor (I'm of thoroughly colonized genetic stock).
I.e., It's fun to try to let Boadicea
win against the Romans and the blasted English, and have a modern
British superpower (or at least viable civ) that is actually British, and not just Franco-Germanic

In the same sense, it's a real challenge to try to have Native Americans in scenarios (18 civ Earth, Colonization, etc.) actually survive the twin Inca/Aztec and later Euro-trash axes of Evil
Which brings me to my point: I'd really like to see some balanced scenario maps which give minor civs a fair chance at survival (and would also be more historically accurate). Case in point... 18 civ Earth map limits native american viability by, basically, withholding resources, which is of course historically and mechanically absurd. It's hard to create alternative histories in a game when resources limit you to meeting those redcoats with archers, longbowman, and dog soldiers ;/ Technology and civic choices are a more fair explanation for why american cultures were in
some areas far behind Europeans. Also, give us some truth at least! We were far healthier than the English up until they gave us smallpox
In addition to this, could some work be done on UUs and UBs ? Some of them are fantastically well thought-out and cool (iron-forge is pretty kickass), and some are absurdly underpowered, imbalanced, or just plain useless (fast worker anyone?) I'd like to see more UUs (two
true for each culture + flavors) that are a bit more fairly balanced. US Seals are certainly a historically accurate UU, but... they always kick the hell out of my dog soldiers ;/
I'm not a proficient coder, and have limited understanding of python, etc., but I'm quite good at the text, worldbuilder tweaking, etc. and would be perfectly happy to lend my time and historical talents if necessary
