well, there are two great things about Extermination: a) the money, and b) no population hassles

While many of us would probably still use Extermination because of the large cash infusion, I think a good solution would be to make it easier for us to manage unruly citizens. In MTW, when fighting rebels, we could let them all go, kill the ringleaders, or kill all of them. When fighting non-rebels we could kill the prisoners or ransom them for money. And you ALWAYS got a hefty chunck of change whenever you sacked a province. It's a shame we don't have that kind of flexibility in RTW.