I have soldered a second USB connector on one and plan to use it as a lazy-person's means of doing some HID (trackball) remapping, though I've not had the time

I have soldered a second USB connector on one and plan to use it as a lazy-person's means of doing some HID (trackball) remapping, though I've not had the time to actually work on that. My current stumbling block was how to keep the included ethernet/serial usb gadget support active while adding a HID usb gadget. I'd rather not have to actually hook up hardware serial to the board if I can avoid it. It's nice to be able to do a one-off thing like that with high-level tools.