[openbox] vi-style keybindings - root-menu

[dcarroll]

Inspired by the article at

http://icculus.org/openbox/index.php/Help:ClaysViStyleSpatial

I decided to be adventurous and go a couple steps further. My goal is to 
minimize the number of hand movements and mouse actions.

First I created a keybinding to map W-m to root-menu. So far so good.

Next, to navigate the menu, I would like to use the j/k/l/h keys instead 
of down/up/right/left arrows.

Is this possible?

Sincerely,

-- Dennis