I had a conference with HP's development team and was able to demonstrate the issues we were seeing with the HP FoD 2.0.9 plugin not populating the pull down menu's even after a long wait (~10 Minutes) At the suggestion of HP, we changed the Key-Secret values in the Jenkins Configuration screen and retried configuring a Jenkins Task to use the FoD Plugin.
While there was still a significant delay of a few minutes, the pull down menu's did populate and cascade properly on the next test. HP and our team did agree that the delay was significant and annoying; but generating and installing a new key pair for the HP FoD account, did appear to resolve the immediate issue of the plugin not working.
HP also said they are working on another plugin release to be available soon. The UI would be somewhat different, and that they would see if they could address the speed issue in this new release or the next. At this point, we ended the conference with our thanks to HP for working closely with us. I also applied a few small updates to the Jenkins Wiki plugin page referencing notes from the HP documentation and including hyperlinks to the documentation. It appears HP is not maintaining the Jenkins Wiki plugin description as well as might be hoped.