As per the question raised in this URL :
http://www.tigase.org/content/how-change-resource-value-tigase-jid#comment-4402
Prefix for a default resource is configurable now.
Example configuration is below. Please put the line inside your init.properties file:
sess-man/plugins-conf/urn\:ietf\:params\:xml\:ns\:xmpp-bind/def-resource-prefix=tigase-
As per the question raised in this URL :
http://www.tigase.org/content/how-change-resource-value-tigase-jid#comment-4402