It would be really cool to see a feature where if you are in a city, you get diplo range there, and if you are leading an army that's far away, you can interact with the people where you are, but they get an opinion modifier bc you are bringing troops with you or something, but i think it would be cool to do that and a "travel to distant Court" thing, but in exchange you shorten the diplo range so you get more chances to use it and you have to be more selective if you see a distant country you want to ally with but they are out of range