Auto close after X amount of days of in activity as defined in the ACP? This would then generate a PM to the user...
Title: Your Support Ticket XXX is Now Closed
Body: AUTOMATED NOTICE: Your support ticket has been closed due to X days of inactivity. However, if you require any further assistance, please:
- Open a "link to new ticket", OR
- "Link to Re-open" your ticket.
Your Support Team:
Link to Profiles of Admin | Link to Profiles of Admin | And so on...
Links support team could also be a new user group "support team" or one defined in the ACP