First off, I absolutely applaud you for reaching out for insight from other stutterers and want to be respectful to him. You've done a lot more than what most people would do. But honestly all of those questions are things that I would ask him yourself. Some stutterers I've met absolutely love one thing while some will absolutely despise it. It all comes down to what your therapist feels comfortable with. Maybe set aside a session to ask himself those things and set some boundaries!