That's how I would do it, with a treat or ball - something the dog wants really badly!
Mine are both quiet dogs - though yesterday Zee did bark when some friends with their GSDs called round - usually neither bark at the door, postman, phone, erm anything. Remus will do a happy bark out on a walk or sometimes playing with other dogs.
I think I prefer them quiet - at least they look the business, deterent-wise and I don't have to teach them to shut up!