I cant really seem to find a suggestion thread, so I just post what I have to say here:
I find revolutions in other empires always a bit surprising, sort of like "what, THEY just not have internal troubles? my, didnt see that coming". so: have you considered some way of displaying the revolution ratings for other civs in the foreign advisor? or anywhere for that matter? something like RFC's stability ratings next to the names.
I know, its city based, not civ based and it may be intentional, because its a type of information you may not have access to. but considering that in history, internal troubles never could exactly be kept a secret (indeed, seperatist groups might even approach rivals for aid) it doesnt seem too abstract. well, I guess it would be a fairly big modification, so I won't press it, but I just wanted to bring it to your attention.
of course, something like that could lead to massive changes in diplomacy and espionage (instigate rebellion, supply troops to rebels, maybe anonymously, demand from a civ to acknowledge their rebels independence, UN resolutions to grant independence and more) but that's probably more something for firaxis to include in civ 5.
edit: damn, almost forgot to congratulate you on that excellent piece of work. kinda sad that it seriously limits the feasibility of some strats though. I found early whipping an extremely dangerous strat early on and multiple relgions can proove quite nasty before free religion.