I have a few very minor suggestions I'd like to share
1) Make customized kingdom troops renamable
It'd be nice to rename your troops. For example, if I had a unit called "(faction name) Spearman", but I re-equipped him to suit a different task, for example a swordsman or an axeman, I can change his name to match. One can also give their units more exciting or even silly names, such as "(faction name) Chosen ones" or "(faction name) looters".
2) Make the player's honorific separate from his faction's culture
What I mean is, when you're selecting a title for yourself after establishing a faction (King, Sultan, Prince, etc), that title affects your faction's culture (what troops you can recruit in towns and castles, what troops companion lords use, what your court dresses up like). For example, one might want to have the title prince but want their troops to be Swadian-based rather than Rhodokian but can't because of this limitation. Also, it causes this to happen
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3) An option in the camp menu to delete ships you have spawned and left on the shore
Ships can get stuck in places sometimes
Their mere existence causes this to appear whenever you hover your cursor over your character on the map
A button to delete all the ships you've left around would be very convenient in cleaning up any messes a player has made.
4) Choosing your vassal's honorifics
I don't know why, but apparently lords preserve the title they had from the last faction they were a part of, when they join yours. Rather than having a Sheik Grainwad, an Earl Vlan and a Knyaz Uqais in your ranks, it'd be nice to be able to set what titles your vassals possess.
Cheers