Better distinction for tickets that an agent reported behalf of the requestor

When agent enters a new ticket behalf of the requester (phone tickets, transferred email tickets), the difference to requestor initiated tickets are minimal. It would be useful if the ticket is marked as "created behalf" already in the very first step and this flag would be visible also in the dashboard and ticket notifications, as well as in the ticket page itself. This would give a better overview for the agents and provide also ability to customize the email messages and notifications.