I always think that the big next step in this game development it would be to implement a more deep political management of the Kingdom, with new characteristic laws and type of government (Republic, Empire, Kingdom, Duchy, County etc) and also relevant novle titles like Count, Duke, King, Prince, etc, or even custom! Ministers with their own duties in terms of economy, army etc; have a Senate, House of commons, House of lords, House of representatives etc. Another important feature it may be a more deep the tax management system too and maybe manage it by regions. Speaking of regions it would be a great feature to have the possibility to design boundaries, for example made theough wars or then agreed with peace, and then in those territory being able to enstablish own politics. However, I must say we still miss even some basic important features like to establish the capital.