Since JBoss Tools 3.2 / Eclipse Helios, selecting a node in the JBPM 3 jPdl editor does not update the Eclipse properties view, which means you cannot edit the properties of the selected node. Neither does anything change when you select the background of the editor (which would normally allow you to change the properties of the process). Making node selections in the Eclipse outline view does work however. A clean installation of Eclipse did not change anything. The behavior is seen in already existing definitions (created with older JBoss Tools versions) as well as in newly created definitions.
This behavior is not observed when using JBoss Tools 3.1 / Eclipse Ganymede.