I'm sure it's probably been asked / requested, but is there a way to tailor the types of tickets groups of users can submit from the portal? Seems strange that the default experience is that anyone would be able to open a new employee ticket.
In Configuration\Ticket Content you can set what you want ticket types to show as for users. This way they can't select it when creating a ticket and if an agent changes it, they will just see the selected ticket type.