I think it would benefit the game if a new crown law was inplemented which restricts title creation to independent rulers only. So if you are an independent king, you are the only one who can create titles in your kingdom. If you are an independent count, you can create a duchy, but not if you have a liege. This can be locked behind high legalism and council authority requirements. iirc this was the case back in medieval times where a dukes and kings were appointed by top lieges not self proclaimed in existing realms but correct me if im wrong.
Also, I think it would be great if emperors could change dejure kingdom borders by decision, or create entirely new kingdoms, with restrictions of course. It can be good merge several small kigdoms into one to avoid having to deal with them all. Imperial reconquest of roman provinces comes to mind as a good place to implement this.
Edit: It would also provide for new interactions like when a vassal of yours gets big enough he may ask you to promote him to duke or king and he might get massively upset if you refuse.
Also, I think it would be great if emperors could change dejure kingdom borders by decision, or create entirely new kingdoms, with restrictions of course. It can be good merge several small kigdoms into one to avoid having to deal with them all. Imperial reconquest of roman provinces comes to mind as a good place to implement this.
Edit: It would also provide for new interactions like when a vassal of yours gets big enough he may ask you to promote him to duke or king and he might get massively upset if you refuse.
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