There must have been a patch with the Scrambled Nations pack. Best patch ever. Now the warmongering hit isn't so severe for just taking one city, and there are various levels of concern at your warmongering. Best of all, liberating a CS reduces your warmongering diplo hit (perhaps a bit too much, but still), so there's finally a way to come back down the warmongering diplo hit ladder, which previously was a one-way street with no way back. It's not a perfect fix... liberating a single CS shouldn't reduce the penalty quite so much, and I wish the penalty would go away with time naturally so long as you don't take another city for a good while (maybe after 30 turns reduce the diplo hit one notch). But one of the biggest complaints going all the way back to vanilla is that the diplo hit for going to war was too severe, and was irreversible. Finally after, what, 3 years, they've made the warmongering system fairly well-rounded. Not perfect, as mentioned before, but about time.