Thanks, great idea!
Kinda heard about VI-keys before, but never gave them much thought. Providing an additional preset to select in the menu would be easy to implement, though.
I'm from germany, working with QWERTZ layout instead of the english QWERTY. Gotta keep that in mind, lol.
For a friend, who didn't have NumPad either, I once suggested Arrow Keys for orthogonal navigation, and something like UI/JK for diagonal (operated with the other hand), which - after a short training period -worked out surprisingly well ...
The [5]-Key isn't really used in tactical navigation, since there's no option to wait in spot. You're always on the move - however, it is used for other actions, like a Stealth-option, or in some Minigames.