What new features would you like in diplomacy?

[King]

And also it would be desirable, that the countries with very high prestige and military power could unite around of themselves the unions with the countries having very small prestige and military power. As it was, when Prussia was hegemon of fine princedoms (German, North German Confederation), and then their association to uniform Germany.

You mean like some sort of sphere of influence type thing?

 

[Darkrenown]

Will the SoI work the same as in HttT? I would like if you didnt need a common border... ormaybe it could be in some way tied to naval strength for countries you have no border with

You don't need a common border in HttT either, your SoI range is based on your prestige.