1) file [JBOSS_HOME]/[CONF]/jboss-service.xml, MBean name="jboss:service=Naming", <attribute name="CallByValue">
2) standard configuration is "true", all others configurations (default, all, web, standard) uses "false"
3) Since the cluster configuration defaults to "false", I'd keep this value as is - thus use Call By Reference. The Spec mandates the opposite, but I don't see why we wouldn't wanna let JBoss optmize /inVM/ calls.
br,
Jens