[otrs] Prevent User ID 1 / root from Owning tickets

We have a relatively "open" permission model for our tickets. Most agents can add notes or replies without owning the ticket. As a result, some tickets go all the way to resolution without having the ID changed. This means that some get closed with the root user (#1) as the owner. Is there a way to force this ID to be changed to a "valid" user within the UI? Hugh