An ancient game by KOEI called "Genghis Khan 2: Clan of the Gray Wolf" had the best province/governors system I've ever seen. They used something like it again in the "Romance of the Three Kingdoms" series.
if asked why out of the five things to put on the new ideas thread why would this idea belong? what are the greatest strength in adding this idea? and what if any weaknesses or exploits does this idea have?
how is your idea different form New Idea #4? could the ideas be merged? improved on?