For 95% of the things I do with my computer I use the Mac, but when I need a PC it often involves input from a USB device. I can't imagine I'm unique. Is there something that we as users of Parallels software can do to improve USB connectivity and compatablity. I'd be willing to plug in some USB devices and log some data if you just tell me where to get it from. Let us work for you.
It's unknown until it's known. While USB is supposed to be 'universal' it never seems to be. There are tons of USB devices. I think sending in some data from more devices than Parallel will ever have access to will have the best chance of compatability for all.