Can we get a couple of events so that when you capture a capital there is a small chance of capturing, delaying or killing some of the enemies ministers?
1. Maybe a 10% chance of capturing each minister (which causes small dissent in enemy, reduces war weariness / dissent in your country)
2. A 5% chance of killing each minister outright (causing a larger dissent in enemy, greater reduction in war weariness/dissent)
3. A 20% chance that each minister is delayed (caught behind enemy lines, didn't escape with the rest of the cabinet) and can't provide his bonus until he gets back - say a month or so.
Percentages above are suggestions.
I think this would add to the chaos of a losing enemy

and add a bit more flavour.