> Could it be possible to emulate a USB device in dom0 userspace?
Yes, that's doable in principle. You could, for instance, connect the 
guest's USB frontend to a userspace process that implemented:
a) the Xen USBif protocol (as implemented by the current backend driver)
b) software emulation of one or more actual USB devices per domain
This should actually be simpler to achieve than implementing virtual USB 
devices for a whole-machine emulator like Bochs, QEmu, VMWare, etc. because 
the paravirtualised interface is higher-level.
Cheers,
Mark
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