Yes this is possible as the USB port on your Pi is able to handle more than a single device if you use a hub. This is demonstrated on the Pi b which utilizes the same processor but also includes a USB hub built onto the pcb which allows for the second USB port and Ethernet to exist. It is possible to share the pis USB port over a network as well, I'd recommend you look into samba as shown here I'd also recommend against using the Pi as a router as it's slow
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