The incident in which Chism and Ferreby died was an unfortunate and unnecessary one, but didn't involve a RIB. It was a foam-collared aluminium craft operating outside it's approved area and sea conditions. (IIRC Brian did some research and found the full report a year or so ago.) This shows that the report is somewhat confused and has grouped generic Fast Rescue Craft (FRC) together regardless of varying design characteristics.
However, the suggestion of head protection in rough conditions sounds sensible.
Ah, the other thread last year was you as well!