Laura/Vlad - there is no siberian wolf in CsW. Difference between siberian wolves and carpathian ones are quite small, but these tqo subspecies evolved separately for quite long time. By the way, I don't think siberian origin would make wolf descendants feel bad in warmer climates (I mean southern Europe, of course Sahara is bit different
), because there is also a warm weather in Siberia (even warmer sometimes than in middle europe), only winters are harsher than here. And I think CsW suffers less in hot weather than most of other long-coated breeds. The coat is quite good isolation against warmth, either.
It is true, that since 1982, when the stud-book was registered, no mixing with wolf or other dog breed shoul take place (at least such puppies shouldn't be registered). But there is this problem - Mutaras are registered in "help register" which should be used for dog which are not registered, but which have all the properties of the breed and could be helpful in next breeding. So they can be used for breeding and after 4 generations their puppies can get registered normally, if all the generations were typical for that breed (no unwanted characteristic occured). So, if Mutaras get good marks (no matter who judges them, just it has to be recognized judge), their progeny in 4th generation could get into the stud book.