Hello,
Since already a lot of things can be customized in every realm, why not allow the ruler to choose who is allowed into the realm's council?
The idea would not be to make it as a normal message group, just to decide whether Dukes are a part of it (and that seems so in Republics and perhaps Democracies, while not in the other governments) with a yes/no option, and perhaps even making ambassadors joining it eventually.
So to wrap up a simple "dukes in realm council? yes/no Ambassadors in realm council? yes/no" option under the realm government page would be interesting, at the very least to avoid creating in every realm a channel for diplomacy for the sole purpose of adding ambassadors there.
In this way a ruler has even more freedom to tailor the resources of its own realm at leisure, and diminishing a bit the differences between types of government that is something the devs have been doing thus far.
I admit is a rather small and perhaps negligible change. But that means it's easy to make maybe
