I think there need's to be a DLC or something that gives more options in regards to diplomacy. There should be some sort of Sphere of Influence system for example, and I think we need Guarantee's of Independence.
Plus, something I think should make sense, I think we need a "Threaten Invasion" option. It seems kind of silly to me that a single Count would try to put up a fight against say a huge empire or Kingdom even if he has some allies or can call upon Holy Orders. Have it work by say having the person being threatened have the option of submitting and retaining his titles, but becoming a vassal of the threatener, or if he rejects it, he can maybe call upon any independent neighboring realms to come to his aid, citing the threat of the larger power as it tries to muscle into the area.
Plus, something I think should make sense, I think we need a "Threaten Invasion" option. It seems kind of silly to me that a single Count would try to put up a fight against say a huge empire or Kingdom even if he has some allies or can call upon Holy Orders. Have it work by say having the person being threatened have the option of submitting and retaining his titles, but becoming a vassal of the threatener, or if he rejects it, he can maybe call upon any independent neighboring realms to come to his aid, citing the threat of the larger power as it tries to muscle into the area.