It would be possible if someone was willing to do a bit of work on the USB implementation - however you've got this problem that you can't have two computers accessing the same filesystem at a block level at the same time. It's why all the Android devices only implement the media transfer protocol now.
Of course someone could implement the media transfer protocol instead ;)
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
There's actually an issue filed for this already: https://github.com/espruino/Espruino/issues/66
It would be possible if someone was willing to do a bit of work on the USB implementation - however you've got this problem that you can't have two computers accessing the same filesystem at a block level at the same time. It's why all the Android devices only implement the media transfer protocol now.
Of course someone could implement the media transfer protocol instead ;)