Guys, for starters I think that the D&D sections in CAP413 and the CAA D&D poster were both produced by D&D and then sent to the CAA. If you want to blame someone for the mix up, not that I think that there is one, blame D&D.
As far as the guys like E R Us are concerned, if you call for a training fix, it's just that, for trg. You know where you are and are just demonstrating the procedure to a student, or perhaps are a student. However, as E R Us confirmed, unfortunately sometimes people call a training fix, but are obviously actually lost. Is this down to wilful lying or is it down to the fact that they were trained to call for a training fix, rather than a PAN? I don't know.
WWW, while I can see the reason why you're suggesting the change to D&D procedure, it would actually make things more long-winded than they need to be. As someone else has already stated, it should be a simple rapid process. You request a fix and straight away you're given it and asked whether you need anything else. I'm sure that the guys wouldn't want it to be any more complicated. Especially when the reason for the complication would be just to try to catch someone out. The D&D guys aren't there to act as the air police. They're there to help people out with no hidden agenda!