Many thanks for your detailed explanation, Diego! It's very helpful.
For the middle name - it's a great idea, actually. Exactly what I was looking for!
And yes, for using "young lady" or "mister" addressing kids - I think it's almost the same in Russian. It really depends on the intonation - it may sound as a warning OR as a joke, so I guess it's somewhat simular.
For more "formal" constructions - yes, Elena mentioned them, but your example is also very useful - so, again, thanks a lot! :)