He did posit that some form of biological monitoring would be built into a potential Valve game controller (biometrics).

ENGADGET

Steam's Big Picture Mode -- a TV- and controller-friendly version of Valve's widely used digital gaming service -- is the first volley in Valve's big living room push.

ENGADGET

However, tech news site Ars Technica pointed out that Valve has a patent on a controller with swappable parts.

BBC: Game maker Valve Software recruits hardware experts