if a civ declares peace to a civ, it should also automatically do the same with any other civ that it is at war with.
PS. if you lose you capital you should also lose any defencive bonus that you might have there on because you troops morel is now low, this would make the capital an important stratigic thing.
PS. if you are to some how recapture you capital it should automticaly be turn in to you capital again, you should be giving the option to recapture cities in the name of other civs.
PS. if there is going to be a revolt for independence you should be first be asked to give it to them peacefully, (beacuse you thinkyou might not be able to win) that new nation will pay you some kind of tribute or come to your aid if in probles or to form a lock allience with it.
PS if a civil war happens to you, you should be given the option to fight for the actual goverment or to fight the for the revels, if you chose to fight for the rebels and you win the name of the nation should stay the same.
PS why do i have some many PSes? well because they are ideas that occuerd to me while writing this post