Thanks for mentioning me (BTW I am a she but that's ok)

No, snakes can never be domesticated like cattle or house pets such as dogs. The belief is that mammals genetically crave physical contact for security and bonding while most reptiles do not exhibit such behavior. Some small exceptions exist such as crocodiles and alligators tending to nests and guarding young when born but the vast majority have no physical interaction at the maternal/paternal level short of keeping eggs warm.

Yes, I do believe however that they can be trained to a lesser extent like some lizards can. I am working on conditioning mine to come to the opening when he is interested in coming out. It is still early to be confident in my results but I have noticed some interesting results that lead me to believe he is learning.

As for domesticating through breeding, I am not sure there have been any studies showing traits, if selective breeding is done, can lead to more docile or agreeable snakes. I would love to know if that is the case because it would completely change our understanding of reptiles. I think one of the reasons we do not know is snakes are bred for appearance and not docile behavior.

I assume you are basing your questions on similar studies and breeding programs done in Russia with wild foxes and seeing if the same could be done with snakes.