In order to reproduce the QA environment that was used for a given release, it must be an integral part of that release. This has now been done and is documented here
http://jbpm.dyndns.org/jbpmwiki/index.php?title=JBPM3BuildingFromSource#Setup_the_Hudson_QA_Environment
This is great news Thomas!
I've been a big Hudson fan for quite some time now and I can only applaud this effort!