Indeed, it works with all inheritances. When the command inherit is issued by an event, any country that controls a province of the inherited country gets to keep it for himself, without BB. For all I know, it works the same as the "secedeprovince" command : no BB, no notice. I haven't checked nationalism, and I don't remember if there is any.
This is what I'd call a VERY BIG EXPLOIT, especially if you previously lead your future prey to grow.
In vanilla, this is indeed most useful vs Bohemia, Hungary, Lithuania, Aragon, who are big. This won't work with Burgundy, since Burgundy isn't inherited as long as it is at war.
This would also work with the Huguenots/Ultra-Catholics AFAIK, but I've never tried with those. Works too with Norway IIRC, Brabant, Cyprus (
I'm not sure of the triggers for this last one, but I don't think it needs peace), Naples, Milan (
same remark as Cyprus), Prussia. Maybe a few others I might be forgetting.
Works BIG with China when it gets inherited by Manchu, and with Mameluks if you manage to get the Ottomans in Egypt province while you take the rest.
