Can you explain what you mean? Maybe I'm missing something.
The only new options I see are influencing region's sympathy to this or that realm and drafting/signing treaties.I agree with the reduced size.
Influencing sympathy is pretty much the entire key to takeovers. Do it well enough, and you can sometimes get regions to flip all on their own.
But why police designation? It's weird to take the local police on diplomatic missions.
Because the sympathy abilities are also incredibly useful within your own realm, to make sure your regions are in top shape.