Having more control over vassals

[RMaRe 4]

So in Age of History 2 when you have a vassal is basically a country that only pays you tribute and where you can send your army but you don’t have real control over it. So I propose we have more control over vassals, like letting us recluse army from there, build in the country, have more control over their economy,  etc… the main difference could be that the vassal's countries have their government which we can influence but not control and they would be like an extent of our country.