Is it possible or a reasonable to ask about exposing USB device support in MicroPython similar to the support for the PyBoard?

Beyond that, is it reasonable to expose even more support so that custom USB devices could be created? For example, a custom U2F token running from MicroPython or an OpenPGP card implementation. I'm sure someone can come up with examples that aren't security related.

Original issue: https://github.com/raspberrypi/micropython/issues/5