I have a wireless keyboard that for some stupid reason does not use Bluetooth. It is a Logitech product and has a proprietary wireless adapter, that connects to the tablet by the USB port. It works fine, but the side effect of this architecture is that I cannot leave the tablet charging. Is there any adapter that would allow me to recharge a Samsung Galaxy Note 10.1 tablet while simultaneously using the USB port? Alternately, is there any newer tablet - 10 inch or larger - that would provide two or more USB ports? Why do so many of these tablets limit themselves to a single USB port?