Can unprivileged user modify a ticket?

Is it possible for an unprivileged user to modify a ticket? When
unprivileged users login to RT, they get the Self Service screen and I
can’t see any way to let them modify a ticket from Self Service. I’d like
the ticket requestor to be able to modify certain custom fields in their
tickets, but I don’t want to make them privileged users in order to do
this. If you know how to let unprivileged users modify tickets, I’d
appreciate hearing from you.

Thanks,
Gene

Gene LeDuc, GSEC
Security Analyst
San Diego State University