These Jira issues indicate that the port issue is resolved for jbpm-console: https://issues.jboss.org/browse/JBPM-2980,
https://issues.jboss.org/browse/JBPM-3396
The jbpm.console.properties in the 5.3.0 installer doesn’t update the file in the war. There is no reference to it in build.xml. Even updating it manually doens't work as URL's are hard-coded to http://127.0.0.1:8080 in numerous files as mentioned above.
Jim