Not to stray too much off-topic, but I was thinking wouldn't it be neat if each Civ had ONE assigned trait and the Adaptive trait? You could then have a lot of freedom playing every civ.
Yes, that one assigned trait would be a key, but at least you could have the option of choosing your second trait. And, I really like the idea of being able to change according to game time and conditions.
What do you think?
PS. Maybe this would not work for some special civs who have three traits, etc.