[PvK]

Seems kind of redundant with culture, not in terms of what it represents, but in terms of game effect. You can already set both culture and then micro-manage the exact levels of each ability for each empire, which can be the results of whatever causes you like, be they government, cultural variations from the base, physiological considerations, psychology, or whatever. Just describe them in the empire's text description, and set the actual levels to whatever you like.

PvK