They will mostly e-mail in to create their tickets, it’s how our current ticket system works.
Then when we’re notified of the new post, one of the support staff will edit it to add the ‘ticket’ tag, which then unlocks the other 3 groups of tags.
My ideal situation is that adding ‘ticket’ unlocks the ‘company’ group, adding a tag from that group then unlocks the priority group, which then finally unlocks the status group.