It's entirely possible that in Virginia Beach police officers are allowed to testify at sentencing, though if so I think that would be an unusual situation compared to most jurisdictions. Alternately, he may mean that when deciding on the verdict or the sentence the judge may take Bruch's testimony about cooperation into account. Either way, I don't think Bruch is intentionally making things up, but I do think he is probably overestimating his own importance to the process. For that tiny minority of cases that actually go to trial and sentencing, the prosecutor presents the charges and guilt is decided based on statute, and the judge doesn't have much discretion to ignore it. The judge may (or may not) have discretion when it comes to sentencing, but the prosecutors are the state's mouthpiece when it comes to sentencing, and the judge is probably not going to care much about what Bruch has to say. Also, you have to realize the entire criminal justice system with its multiple layers of procedure was created to deal with human limitations. Bruch might think he's some sort of wise, objective adjudicator but in real life nobody is, not even the judge. That's why these procedures are put in place.
Is it possible that talking to the police without invoking your right to remain silent could benefit you in the long run? I guess if the stars align right it's possible. But 9,999 times out of 10,000, it's better to talk to a lawyer before talking to the police, so you'd be taking a pretty huge gamble not doing so. And it would really be a gamble because you are never going to be in the position, as the accused, where you can objectively evaluate whether it's possible or not, no matter how smart or well-educated you are. And there are plenty of honest cops who try to put innocent people away, so it's not really a question of corrupt or not, it's just that you don't want to gamble that the police will have a hunch you're innocent rather than a hunch that you're guilty.
Anyway I hope I don't come off as too harsh, you're obviously a smart guy and you've given this a lot of thought, it's just that these issues have been debated for over 200 years and I think you're ignoring a lot of that history and taking an overly rosy view of the police. Since you seem to have an interest in the law, have you thought of pulling a Karl Auerbach and just actually going to law school? The schools are desperate for applicants so strong candidates have lately been able to negotiate pretty nice scholarship packages.