Hi lpetrovi@redhat.com,
The JMS settings for IBM WebSphere AS is documented here:
https://access.qa.redhat.com/documentation/en/red-hat-jboss-brms/6.3/single/ibm-websphere-installation-and-configuration-guide#setting_up_jms_resources
and
https://access.qa.redhat.com/documentation/en/red-hat-jboss-brms/6.3/single/ibm-websphere-installation-and-configuration-guide#add_custom_jvm_properties

Request you to review and provide your feedback on the same.

Regards,
Vidya