tu_79
Deity
A colonist settler will always found a colony, but a settler will found a colony when outside a certain range of the capital (all of these can be modified in the user settings, however).
You can't toggle it at your leisure, no - you can make a colony, turn it into a real city (with a Great Magistrate/Dignitary from RtP), but otherwise it'll stay a colony. But it, for me at least, solves the issue of micromanaging late-game cities - which is the main inspiration behind the system.
Why would you ever turn it into a normal city? I'd say it would be more desirable to leave most cities automated while you focus on your military targets. Like we already do with workers (micromanage them the first turns, when it's really important to control what they are doing, and automate them later, when anything they do is fine whilst they keep working).
Oh, forget about what I say. Your mod seems good, thematic and relieves some tedious work.