Is there anyway by which a customer can add an update to a trouble ticket, other than on close?
The portal would be an ideal place for this, having the front-end security and general availability from any location via browser (one might not always be able to pull down email, or when out-of-office have access to an email with the trouble-ticket link.
The bonus, to Zen, would be a potential reduction in in/outbound call volumes as a customer could provide updates such as test results, engineering visits, etc without tying up one of the TS team. In addition, there may be occasions where vital information from the customer is recorded "as-is" rather than being diluted/lost during the course of going from front-end team -> faults -> CS (for example), or plain info overload on a TS member.
Just a thought.
Just ickle ol' me.