But since he was not in custodial detention he was not entitled to the presence and counsel of an attorney. ...
Actually, a person is absolutely entitled to counsel anytime he feels like it (otherwise, Skid's exactly right in his comments). But as an evidentiary matter under the Fourth and Sixth Amendments, courts aren't going to suppress information obtained by interrogation in the absence of counsel where there is no custodial arrest (whether express or implicit); and since that's true, it's best not to engage in chit-chat with the cops at any time. So if you say, "I want my lawyer", and they say, "You're not entitled to a lawyer because you're not under arrest"; then you can say, "Ok, then, I'm leaving now." or, "Ok, then, you're not entitled to hear me talk."
A response such as, "Thank you, but I prefer not to chat right now, officer." is pretty much always a good answer, because it is polite and articulate. And if the cop insists, that's when you say, "Am I under arrest?"; "Am I free to go?"; and "I want my lawyer."
That last one is always the most amusing, because the standard response is, "Why do you think you need a lawyer; what have you been up to that makes you feel guilty like you need a lawyer?" And the simple answer to that is, "Because you're holding me here against my will, so I must be under arrest. That being the case, I want my lawyer."
Another thing to keep in mind: at checkpoints, the main thing they're looking for is DUI cases. And the standard litany that they all recite in court is as follows: "His eyes were bloodshot, his speech was slurred, he was uncoordinated in his movements, and I detected a strong odor of an alcoholic beverage about his person." Well, if you can rattle off a sentence like, "Thank you, but I don't feel like engaging in any chit-chat this evening, officer.", then it's going to be hard for him to establish probable cause on the basis of slurred speech. (I did have a client, once, who had a bit of cerebral palsy, and whose eyes were always bloodshot, always had slurred speech, and always was very uncoordinated in his movements. And he would light cigarettes while driving, which made him swerve all over the road.)
My website moved from GoDaddy to Network Solutions. I didn't like GoDaddy's sexist advertising and it seems to me there was some issue with their advertised positions on personal defense rights. Besides, Network Solutions is located in Virginia, which makes it easier for me to deal with them (and harder for someone to sue me in Arizona where GoDaddy is located). (Side note, I don't like Kahr's advertising or where they're located, either, but I've got four of their products; they have terrific customer service.) In making the move, I found I didn't have time to set up everything the way I had it before - it took me months just to get the website working at all (I write the HTML myself). Someday, I'll get it into better shape. Those course notes may be out of date, anyway.