I think that the WE percentage should lower the cost of provinces when negotiating peace.. So that when you hit 100% WE you should give pretty much more to get the same effect. That much WE would make the leader of a country pretty desperate man anyway..
I for example rolled over whole France as Austria, occupied and controlled all of their European provinces, had annihilated their army, and had their WE at 70%.. I also had taken almost all of their holdings and colonies in Africa. Yet all that I could claim were those african lands.
Ok, I could claim more, but they wouldn't give it. Out of 100% war score I could get maybe 70% worth of land.. And they really had no hope. I was tempted to try and see what happens when their WE reaches 100%, but then those pesky swedes started making invasions into Northern Italy controlled by me, and I was annoyed enough to take what I could get from France..

o