Love it! Except the fact that Alexander pops up and then u choose to change te civ/leader can u change this so that u pick the civ right at independence? That way it won't take up 2 civ slots
I think the colony thing can be done before the normal colony appears, by deactivating the normal liberation function and writing a custom one. Should not be too hard.
Just to say: Works

The popup which asks which cities should be liberated is sadly in the .exe, but I can hook in the code before and create such a screen myself. That does already work

-> does anyone by any chance know with what exactly new colonies start? I know, all techs from the master, and some sort of defense unit (AFAIK 2 per city, best conscriptable unit), but else...? Money, preset civics, preset state religion? I think the latter 2 the new civ is doing itself, but other stuff? What happens with culture buildings in the cities? Are they destroyed or do they stay? Does the vassal share any diplo attitudes with the master (I mean -2 you traded with our worst enemy), or is this independent?