The original Logitech G-15 - Beauty. Try the Logitech website, although they dont make the model with 18keys & a screen anymore (the one with the screen now only comes with 6)

I maybe off here, but this is what I do..
I would start by getting an action bar mod. There's a few that people recommend on here Bartender being one, but Bartender has become Dominos which is what I use.

http://www.wowinterface.com/download...5-Dominos.html

The beauty is this makes keybindings very simple. Once you have the action bars configured a simple shift left click of the dominos addon takes you into key bindings... from there you can Shift-Control your way to a brighter future. Once thats done it's a simple case of configuring the keys press the MR Key, Select an M Key, Set your key stroke and hit MR again.

If there's a way of creating keybindings in the way you're talking off I've yet to find it.