The Ticket Types add-on for the SLA24 Service Desk adds Template functionality to the Ticket Types field option (available in the free core plugin).
With it, the admin can set up text based templates or prompts for ticket subject and descriptions that varies based on the ticket type the user selected.
Additionally, the admin can optionally make either the ticket subject or ticket description or both read-only for any of the ticket types.
These options are most useful when a user needs to be guided in providing a free-form description of their needs. For example, when a user is submitting a bug, you can set up a template that looks as follows:
Or, if the user is submitting a request to delete their data, you can pre-fill the form and disallow editing: