Well,
If you unpack the jBPM5.2 source distribution, the source code is organized into a set of what I would call "modules" (although perhaps that isn't the best term to use):
jbpm-bam
jbpm-bpmn2
jbpm-bpmn2-emfextmodel
jbpm-distribution
jbpm-docs
jbpm-examples
jbpm-flow
jbpm-flow-builder
jbpm-gwt
jbpm-human-task
jbpm-human-task-war
jbpm-installer
jbpm-persistence-jpa
jbpm-test
jbpm-workitems
As you can see, included amongst these is jbpm-human-task and jbpm-human-task-war.
As previously stated, I haven't actually investigated the latter in detail, I am merely inferring its function from its name.
Hope this helps!
--JE