I couldn't see these included in the post.
-Being a vassal, king, lowlife, trader, blacksmith etc. should shape the way dialogues are formed. As a king after entering into your town/village and getting "Go fetch me 10 sack of grain boy." type of missions from local traders are mood and RP killers like nothing else.
-At the start of the game we shouldn't be able to talk to kings, vassals and etc. till we have some renown. Why would a king talk to a god damn peasant?
-Peace negotiations should be made face to face by kings/queens on a negotiation table. Which should be easy as the game already has AI calculation for trading which can be implemented into negotiation of peace.