Hi Alejandro,
People complained that they could find jbpm.bpmn.cfg.xml in jBPM 4.3 distribution. I uploaded a patch for adding sources and resources to distribution. But I cannot test it, because I can't acess qa.jboss.com. Could you have a look at this? Thank you very much.
Here is the patch:
https://jira.jboss.org/browse/JBPM-2788