Thanks for you comment and suggestions!

Regarding key bindings, I'm planning on adding some soon, so that it can be fully interacted via keyboard (not sure if I'll use vim bindings exclusively — non-geeks don't know about vim).

On pandoc integration, it's complicated, since the server-side is implemented in node.js. Anyway, my To-Do has an item on supporting markdown :)

Finally, this won't be commercialized. As long as I have few-to-none costs supporting the hosting, it'll be free forever (i.e., why the heck people have to pay for these kind of editors?)