I'm using a USB device (well, it's a USB PCMCIA card writer) with a conf file setting of
usb1: host=0781:5406
and I don't see any high CPU activity in Windows XP.
I have found that the syntax...
device_add usb-host,id=whateveryouwant,vendorid=0x0461,productid=0x0010
(note you need 0x in...