[simias]

I don't have arrow keys on my board but I have something better: I have a special modifier that lets me use readline-style commands (C-n for down, C-p for up, C-h for backspace, C-d for delete etc...) anywhere without requiring the app to support it, since it sends the compatible down/up/backspace/delete/... keycode instead.

I finally don't have to worry about this or that program not supporting this or that binding, it's uniform everywhere.

You say that you already use hjkl (I assume?) in Vim, so clearly you have the muscle memory for that, why not extend it to all applications?

And there's so much more to programmable keyboards. Modifier keys that input characters when pressed on their own, allowing for dual function. Some people like remapping caps lock to control, others to escape. Why not both? My keyboard has a key that behaves like control when chorded and like escape when pressed on its own. The best of both worlds!