I think it's wise that we separate various hoses, etc from the main body of the manually uncoupling. It adds a little better immersion. While you don't have the option pull leavers on them at the moment i'd be nice just to have to do one more action to get it uncoupled fully where applicable.
I also had the thought as well, potentially a toggle in settings "realistic coupling procedures" in this mode, if applicable to the coupling type everything needs to be connected and disconnected seperately. E.g. When coupling a class 47 on NTP. You'd need to couple the screwlink coupling as normal but then you'd manually have to click to connect the air brake pipe, main reservoir pipe and electric train heating connections.