Did you ever get it to work in Designer 7.2?
Designer / Eclipse gives me this error in the log
!ENTRY com.webmethods.caf.faces.google.ui 4 4 2009-11-06 13:28:24.808
!MESSAGE ExtensionsUIPlugin.InternalError
!STACK 0
org.xml.sax.SAXParseException: The markup in the document following the root element must be well-formed.
#MWS-CAF-Task-Engine#webMethods#webMethods-BPMS