Sometimes restrictions are used to convey things to staff or patron. It would be helpful if patrons are notified of restrictions placed on the account. This is one I would suggest that should ask if a notice should be sent to the patron at the time the restriction is created, and what type of notice (format).
I could see also adding options for defaults in delivery method, but allowing staff to change that when the message is saved. Maybe the patron is being restricted due to a bad email. Then we might want the patron contacted via phone or text.