Hi, I admit I haven't used this feature, but your question prompted me to take a look at it. Are you sure that the certifying body is cc'd on all messages? That isn't immediately apparent based on the interface, but if it is true, it seems like a breach of "netiquette" and should be more transparent.
It also does seem odd that you can't delete team members from messages. The interface makes it look like you can, but it doesn't seem to work this way.
Seems to me like this might be a useful place to have a repository of project-specific messages, but I would personally hesitate to use it unless the questions you raise are addressed.