http://www.inspector-gadget.co.uk/blog_134.shtml Writing drivers to support the above may be a solution to the whole usb host mode problem.
Sadly, it appears the review at inspector-gadget is entirely off-base and this device is simply another USB hub with built-in Bluetooth adapter, not a magical USB-Bluetooth bridge. The first clue was that QVC UK (of all places) sells it. The second was the product description and review there.