This would be especially helpful for Admins who provide more than just email support. If a user submits a ticket and then calls, it would be great if they had the ticket number for reference. This would make it easier for the support staff to quickly access the ticket.

Also, some users are reporting issues to their superiors and being able to have ticket numbers for reference would help greatly. Especially, since many may have multiple tickets open at once.

This wouldn't necessarily be a good fit for every business, but it would be nice to have the option to enabled it if you wanted to.