Spatzimaus
Mad Scientist
Not to plug my own mod too much, but the more direct way to slow conquest is to just make offensive military actions more difficult in general. For instance, I did two things that apply here:
1> Instead of +2 defense, the Palace gives +10. (This makes capital cities VERY hard to capture in the early game. You can still pick off lesser cities, but the one with most of the Wonders and such will be almost untouchable without a truly massive force.)
2> Every unit gets the Home Field Advantage promotion, which gives +10% when fighting in friendly territory and another +10% when attacking within friendly territory. End result: "skirmisher" tactics work well, where a defensive cavalry unit can deal disproportionate damage to an invading army and fortified infantry are very difficult to dislodge.
Attrition basically forces an end to wars well before you can completely conquer a foe, and you can't do the whole continuous war method in an environment like that.
when captured instead of 50%
penalty from each conquered city is nearly double, making it harder to conquer cities rapidly.
income, yet we must still pay maintenance on its buildings. This can make net gold quickly go into the red.
XP bonus in the Honor tree.
.
I really hope Firaxis are going to realise their mistake & change it in the next patch. 
) allow this?
