Thank you for letting me know! I do not think that keybindings will be the next ting i'm adding.
The app is based on a custom JavaScript editor. I've started the development of this editor three years ago. It mainly took me so long because I've build it with collaborative editing in mind.
Today I would probably use ProseMirror for that, but back then I've decision to build a custom solution.
So collaborative editing is one big topic I've planed to introduce next.