Ability to disable "Close Silently" for technicians

Amazed this isn't already an option, but this is urgently needed!

We would like administrators to have the option to disable the "Close Silently" action for technicians.

Our organisation requires all ticket closures to notify the customer unless there is a valid reason not to. The current feature allows technicians to silently close tickets, making it difficult for managers to ensure customers have been informed and reducing the auditability of the support process.

Ideally this could be implemented as either:

• An administrator setting: Allow technicians to close tickets silently (enabled/disabled).
• A dedicated permission such as Can Close Silently, which could be granted only to administrators or team leaders.

As an additional enhancement, it would be useful if the ticket history clearly recorded whether a ticket was closed normally or closed silently.

This is important for organisations operating under ISO 9001, ITIL, or internal quality management processes where customer notification on closure forms part of the service audit trail.