Wireless keyboards are a good option if you rarely use it, but I can see an argument for a drawer. Holding onto a keyboard with one hand and typing with the other gets old pretty quick, especially if you find yourself jumping between keyboard and controls often, with no convenient place to rest the keyboard.
But I wouldn't put any sort of pull on the front of the panel. It would make it look like an IKEA desk instead of an arcade panel. Instead, I would leave the face of the drawer to overhang the bottom and simply pull on the overhang. No knob necessary and could be made to blend in with a little effort.