I never thought I'd say it but it's true. I've finished two long campaigns but I usually get a faction about 3/4's of the way there and call it quits. It just gets too tedious to take the last 16 provinces or so once all of Rome is yours. I think it would be more enjoyable to tone down the squalor driven peasant revolts and replace them with ambitious governors, or ethnic driven rebellions and the like.

In a recent German campaign it would have been a challenge to have Britain rebel, for instance, after I had moved my capital to Milan and was driving into Greece. It would be historically accurate because most "barbarian" leadership was personal and with the great leader or his armies far away why wouldn't an ambitious nephew want to be his own boss?

It would also be good to have your Roman faction face a lot of uncertainty as it went for it all during the civil war. Family members are way too loyal, and many of the non heirs in the backwater should be tempted to switch side or set up their own shop.

Just a thought.