T50 USB Redirection / HDX Plug-n-play

The T50 claims support for Citrix HDX Plug-n-play, however I am unable to get it to work on the thin client with XenDesktop 5.6. Moreover, I cant even find any info on how to configure HDX PnP for the T50 in the Admin or INI guides.
I do have it working with Windows Receiver, so I know the Citrix XenDesktop environment is setup correctly.

Any ideas?