You already can, just load up a crosh window and enter your chroot. Take your pick of vim or emacs or whatever other console editor. Or, if you're enterprising, you can run a window manager on the same X display and use any GUI editor, but the integration is a bit wacky.

Nitrous.IO already did that.

There's already many, many ways to do this and it works fine for me on (primarily) web development.

Wow. Lost karma because I'm enthusiastic about something? Neutral, I'd understand... but downvotes? Really? I've seen even more plain and simple comments get upvotes. You folks are a fickle bunch.