No plans really. I suppose we could give Kuriotate settlers a button for "build a settlement". Let me think about it.
I would second this option. Also, In playing the Kuriotates I had my first 2 cities doing well but had a barbarian city starting to annoy me so i went out and took it over thinking i could make it a settlement as otherwise the cities 3 rings would overlap with the 3 rings of my second city. So could there be a way to choose if a onquered city could be settlement or city, also? In hindsight i should have razed that barbarian city but that is something i rarely do unless playing as a civ that requires me to do so.