[otrs] Easily switch user when logged in via Kerberos

Hi, is it possible when using single sign on with kerberos that a user can logout and enter username/password to login as a different user? I can also login with LDAP to a Windows AD, as I can with Kerberos. So can OTRS offer a choice on login to either use the current Kerberos credentials from the browser or to enter a username/password for an arbitrary user? Thanks, Anselm