Working in Seamless Mode
Seamless mode is a remote desktop feature that allows to display only specified remotely hosted application without forwarding the whole desktop.
USB for Remote Desktop works perfect in seamless mode. Please note, in this mode USB for Remote Desktop tray icon can not be displayed by default. To switch between different USB devices right-click on the title bar of the application working in seamless mode, go to the USB for Remote Desktop item and choose the device.
In order to display tray icon, it's needed to publish USB for Remote Desktop tray application and then launch it.