[cupcakestand]

Right. To navigate the site you can use browser extensions like Vimium.

There is even an extension for using Vim bindings in HTML text areas but this one doesn't work on mobile and also on desktop it's a bit clumsy.

I would just exchange the current HN text area with some HTML editor with Vim bindings such as Codemirror.

[antouank]

I'm rewriting it in Elm right now, so I want to avoid any js library. Also, the HN API doesn't allow auth, so you cannot submit or edit posts from any other app.

But why would you want this? I mean do you write lengthy posts? Or do you post that often? I can imagine a very small percentage of users would use that feature.