So I don't think we have many of our cleanup options turned on, but I could see where especially with AD users, it would be handy to have it clean up and remove the users when they are removed from AD.
My question is - what happens to the tickets? If someone opened a ticket and then that user no longer exists, what happens? Who does it show opened the ticket? While I certainly understand the need to clean users out, I also see the value of knowing who opened a ticket, even if it were someone not with the organization any longer.