I'm not sure the long crowing ability is genetic although it may be partially so. The Tomaru from what I have read is not as nutty. They have also been crossed with several other breeds, in part because they seem to have very little tolerance for cold. The birds I got from Sandhill showed obvious influence of Sumatras. One of my roosters even had multiple spurs. The newest import ('02 I believe) was crossed out to Javas for that reason. Don't know how well they crow. The ones I had were a bit flighty but not terribly so. The Denizli are the real head cases in my opinion.
There might be something to the genetic angle with them, as I can't imagine why they would have been selected for that degree of insanity. Unless of course they were developed in a semi-feral situation.