With foot pedals and a mouse and he could probably play FPS games at a high level. It's mostly about the mouse hand. There are also mice with a lot of buttons,

With foot pedals and a mouse and he could probably play FPS games at a high level. It's mostly about the mouse hand. There are also mice with a lot of buttons, like the Razer Naga: http://www.amazon.com/dp/B004AM5RAM http://www.amazon.com/dp/B004AM5RAM Voice commands in games is becoming real: https://www.youtube.com/watch?v=RmsuTiuRaog https://www.youtube.com/watch?v=RmsuTiuRaog