I don't think I use the title Sensei other than in class or in being descriptive. That's not to be disrespectful. I've never called a teacher of anything, "Teacher". But I call them Mr. or Ms. accordingly. In the Dojo, I don't often ask for anything. I use proper etiquette when bowing and entering or leaving the mat and use "Domo Arigato Gozaimashita." or "Thank you very much, Sensei."
Something for me to think about.