I had no trouble using the mouse+kb with the rift. Also, the Razer Hydra seems to be the controller people are converging on. I believe Carmack will have a huge impact on getting other developers to adopt the Oculus VR tech. It's one thing for Palmer Luckey to get the support of Valve, Carmack, and others, but it's a whole different world when Carmack can spend his productive time improving the product, getting other developers to adopt it, and bringing it to market.