
The concept behind this layout is the left side of a computer keyboard, optimized with essential keys for playing FPS games. It was designed for TheVan RoadKit, but it should work for any 4x4 ortholinear keyboard.
I play with my pinky on Shift, thumb on Space, and the rest of my fingers on
W A S D. I use my thumb for Control, X, and sometimes C. I usually use
Z with my ring finger. It also helps to angle my fingers more perpendicular to
the board in order to allow my thumb to more easily access the Z X C row.
The number keys 1 2 3 are missing for weapon switching, but you can usually
switch with the mouse wheel or rebind those to Z X C or something else.
The key R for reloading is missing, but I prefer to use my extra mouse buttons
for that.
I don't really use Alt for games, but I kept it around for Alt-Tab in
Windows.
+-------+-------+-------+-------+
| Tab | Q | W | E |
+-------+-------+-------+-------+
| Esc | A | S | D |
+-------+-------+-------+-------+
| Shift | Z | X | C |
+-------+-------+-------+-------+
| F | Alt | Ctrl | Space |
+-------+-------+-------+-------+