I know nothing about virtual routers, but I only use the USB cable when I need to transfer an ebook that is too large to send via email. Since I have a wifi only K3, I use @kindle.com address and send any book I wish via Calibre's excellent connect/share button. If you have a 3g Kindle, use the @free.kindle.com address.
I know that these type batteries have a finite number of charge cycles, so I always use wifi to transfer my ebooks to save on the charge cycles. Plus, it is very simple and easy to do and I only have to remember to switch wireless on to get my ebooks that are waiting to be d/l to the K3.
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