Count me in.
When I play these games, I don't see myself playing it like a game of chess, where I'm trying to win on an even playing field, with well defined and pre-existing rules, and no surprises apart from what my opponents do under those same rules.
Instead, I see it more like I'm "writing" history as I play through the game. Winning or losing a particular game is secondary to simply having an interesting story and interesting situations develop during the game itself. I'd actually rather lose a game because of something totally unexpected and cool happening that I wasn't able to adapt to well enough, than win a game by plodding on methodically to the finish line.
For me, a truly great game is one that's not only fun to win, but fun to LOSE! Losing because the AI had a better start or balanced its books better than you can be demoralizing, but losing because all hell broke loose when some cool event happened... well, that can be downright fun!
With that in mind, I'm not worried about how unbalancing they are (especially since they'd be optional).
-Cauldyth