Andrew M, I see your point about the lack of training in carb heat and mixture - but every aircraft has its own little curiousities, and no one would get into any aircraft without appropriate training for that aircraft. If someone learns on a diesel aircraft with FADEC, and then wants to transition to a Continental or Lycoming powered aircraft, they would need to convert.
So, for PPL courses completed in FADEC aircraft, do we suggest that rather than going for a type rating in a C172 or whatever - then we go for a small non-FADEC aircraft rating (like the IMC and night rating) then a type rating as normal, or just the first type rating off a FADEC-powered aircraft is extended to take heed on the fact the student has not only not flown the aircraft he/she is doing the type rating for, but he/she has never flew ANY aircraft without FADEC.
I cannot really explain this properly, but basically what I mean is - learning how to use mixture/carb heat and so on is normally taught during PPL, so it wouldn't need to be re-taught when doing a type rating - only characteristics that make the particular aircraft different is need to be taught.
However, if he/she is only used to FADEC, then they will need to know a little more on the first type rating than your average PPL student.
Best regards,
Andrew