Earlier quoted context omitted.
Seems like a horribly convoluted way to manage permissions. Also I have never heard anyone suggest you shouldn't use a local admin account. That's the exact problem UAC was meant to solve. Having used an unprivileged Windows account, all I can say is no thanks. It's a huge burden if you do anything even slightly more complex than Facebook and email. As a blanket policy at work, all programmers are admins, everyone el…
Nobody does what you describe. When someone has a genuine need for local admin access, they are given two accounts - an unprivileged account to log in with, and a privileged account to enter into UAC when needed. It would indeed be an unbelievable waste of time to make your IT staff sit next to users to enter admin credentials, which is why nobody does it. And for the record, "don't log in with a local admin account"…
Counterpoint: I've never heard anyone do what you describe. Therefore no one does it, even though you've just described to me who does.
What exactly is the threat in using a local admin account? I can't think of anything you could do that wouldn't show a UAC prompt. The entire point and purpose of UAC was to prevent malicious elevation without the user's knowledge. I'm really not sure what you accomplish by adding a password to UAC prompt the user wouldn't have read either way. The end result is the same.