Many users are comfortable using gaming keypads. There are several that come with a wireless connection. You could try connecting one of these to your robot if you want it to seem more like a real video game. In my system, I actually used the wireless keypad from HausBell and mapped the arrow keys at the top of the keyboard to tell my robot to go forward, backward, left, and right. I figured out which keystrokes these translated to by simply running my program and looking at the print statement in the program.