Sub Account send support ticket with/without copying Account Holder
A Sub Account may want to contact support regarding something totally unrelated to the account that they are attached to. At the moment they have two options, 1) change the email address for the Sub Account or 2) email us from another email address. Either way they require a 2nd, 3rd, 4th email address and so on.
I suggest that if the Sub Account wants to send a ticket support regarding an account, they open the ticket initially via the Client Area, after logging in as the Sub Account. Then when they receive a response to they email account, so long as they leave the subject as is, they'll be able to continue the conversation they started in the Client Area via email.
Then if they wish to contact support/sales regarding something else, they can just send an email in direct and that will open a new ticket that is not assocaited with any account.