All of what you ask about is highly individual according to the guide dog team. Some dogs go berzerk if you praise them too exhuberantly, and think you want to play when it's work time.
Some dogs are highly folcused and like praise, but are business-like in their demeanor.
The Seeing Eye officially discourages conversational commandings, but all of us do it to a certain extent I think. What matters is whether you get the results you want from your dog and whether your dog is a good representative for both the master or mistress and their school. I had a question that I've been curious about for a long time. He doesn't wag in harness. He barely show any emotions.