Looks like this is possible now on the Pi Zero (with some kernel tweaks): https://learn.adafruit.com/turning-your-raspberry-pi-zero-into-a-usb-gadget/overview

Looks like this is possible now on the Pi Zero (with some kernel tweaks): https://learn.adafruit.com/turning-your-raspberry-pi-zero-into-a-usb-gadget/overview https://learn.adafruit.com/turning-your-raspberry-pi-zero-in...