I may have mis-read his question. Only an experienced, competent person who is familiar with the equipment can train another. The laws here in Canada do not state that the individual must be competent to operate the attachment however it does state that the operator must be familiar with the steering, braking, controls parking and load handling. Although there is no 'certification' for attachments, I do train and watch the participants re the attachments.

A sideshifter training is all about maintaining the forks balanced left to right, A rotating carriage, fairly obvious. A paper roll clamp, a different story all together. And for my clients, I do determine their level of competency on both the forklift as well as the clamp attachment.

So, I may have incorrectly understood the original question, but according to the law, yes, a competent person who has the knowledge, training and experience can demonstrate the use of the attachment to a certified forklift operator. But in reality, who knows?

Just to add....I do not see many exotic attachments where I train.