That's interesting - I wonder if that's what Techskater meant, though? S/he seemed confident that there is something official in writing that calls for CER-A/B on Club Ice. I did a lot of research on Registrations/CER over the summer because the documents seem to contradict each other in places, so I think that would have caught my eye. If it's buried somewhere ina USFSA document, it needs to be brought to light. I'm sure there are a lot of LTS-only coaches who are not registered or CER-compliant.
While you're discussing the difference between Coaches Registration and CER Compliance, you have to also explain the difference between the Coaches Registration and the Basic Skills Instructor Registration. They're mutually exclusive, but there are two different lists the Club would have to check to verify a coach's compliance.
For the record, there is a CER-C curriculum available for free. IMO, all Basic Skills coaches should take the CER-C courses if they haven't completed CER-A / -B. It's optional, free and you get PSA credits for it. More importantly, it's a good way to learn about the Basic Skills curriculum and managing classes/customers.
There's a discussion about CER-C in the Coaches Lounge.