Show device only for specific users

Hi,

I have a list of USB devices connected to the computer where virtual here server is running:

 - Some of the USB devices should never been visible (on the client) for any users [ it is ok, I use the "IgnoredDevices" parameter in the server config.ini ]

 - Some of the USB devices should be visible (on the client) only for specific users [ how to do it?  ]

 - The other USB devices should be visible for any users

I'm not talking about authentication, which I can already do. I'm just talking about making some devices visibles or not on the client, depending on the user.

An intermediate solution could be to hide a device from the list but give the ability in the client to manually add a device (make visible a device that is by default hidden). 

Any ideas ?

Thanks

Laurent