This could be (roughly) modded in. All you'd need to do is create a bunch of titular cardinals, make the Papacy a feudal-elective title, and add a bunch of events and decisions and things to distribute the cardinal titles. It wouldn't be perfect, but it'd be better than nothing.
And acquiring the Papacy is one hell of a way of improving the standing of your dynasty.
"incorrect."
"uh, no" (you and I both know how that sounds, I don't like it when people do that in person and that was the way you intended it).
that's attitude.
and yes it IS outside the scope of this game. everything papal is ABSTRACTED because your DYNASTY is the main thing.
And acquiring the Papacy is one hell of a way of improving the standing of your dynasty.