The ability to auto-assign tickets based on the category is a good feature (and expected).
However, when a staff member is creating a ticket from the SD interface, they should be able to override whom the ticket is assigned to. As it is now, the staff member is selected and you’re unable to change it when creating the ticket.
When you select a category that is auto-assigned to a staff member, you can’t change the staff member. See the attached screen shot. The Assign To drop-down isn’t active when the category is selected. It doesn’t show in the image, but the cursor changes to the prohibition sign when you mouse over the drop-down.