Just a thought, not sure if anyone is working on it.
A mod do add either generic or region specific decision to form an Empire when you have multiple kingdom titles.
A regional one might be if you have 3/4 of King of England/Scotland/Wales/Ireland be able to form an "Empire of the British Isles" and hand out some of your king titles to vassals/heirs and still keep control over them(with a -30 wants to be independent relations mod or something).
A more generic one might be if you have at least 3 Kingdom titles form an "Empire of <Primary kingdom title>"
Maybe ill take a crack at it if one doesn't pop up
~Masked Dingo
A mod do add either generic or region specific decision to form an Empire when you have multiple kingdom titles.
A regional one might be if you have 3/4 of King of England/Scotland/Wales/Ireland be able to form an "Empire of the British Isles" and hand out some of your king titles to vassals/heirs and still keep control over them(with a -30 wants to be independent relations mod or something).
A more generic one might be if you have at least 3 Kingdom titles form an "Empire of <Primary kingdom title>"
Maybe ill take a crack at it if one doesn't pop up
~Masked Dingo