I have gotten him to not bark when people walk by our car when we are waiting for my son to get off of work. He works at a hotel so there is alot of foot traffic where we wait. The first few days he barked and growled at everyone. Now he will only growl or bark if someone gets too close to HIS car. Sometimes people want to walk over and pet him and I know he is being protective, I just tell him no barking. He is improving a little bit. As for the walks, not too much has changed. Treats don't phase him in the least. I have tried to get down to his level to get his attention, but he really could care less. (and I thought he wuved me)
I am not giving up though! I look at it as a challenge. One day he will be the social butthead, I mean butterfly I want him to be. lol.