Nah, probably worst suggestion I've ever heard of. It sounds simple to do but much more difficult to execute. What recording software people would use, there are ways to abuse it, puts much more strain on the person's computer and the staff would have to track that everyone doing a service is recording their training which is almost close to impossible. Advising it makes no difference; a service owner can simply decline it (like Jonny said he would do.) Technically this has always been around with skype screenshare and everyone on the forums use skype. I've done a few services over skype screenshare and I've actually won a dispute because of it.