Users and groups (auth/autz) via kerberos/ldap/active directory? Radius? Not something "most users" would need - and probably handled in Pam, not sudo - but it

Users and groups (auth/autz) via kerberos/ldap/active directory? Radius? Not something "most users" would need - and probably handled in Pam, not sudo - but it's one thing that comes to mind.