Yes, that's me using a Wii Remote to control the game, including shaking for Star Notes. More news on that soon, I've got some ideas I want to try with this stuff. First thing would be attaching a Nunchuck so you have all four buttons instead of just two. Sadly I'm poor so I don't have the full version. I only have the Trial version and so I can only play up to Normal which has only two buttons ;_;
Nope, GIMX. In a nutshell, Wiimote communicates with Bluetooth Adapter #1, Laptop (the one in the background) processes the data via wminput and cwiid, sends it to PS3 with Bluetooth Adapter #2. Sounds kind of complicated, but actually works pretty well, not even with that much lag, just about 20 ms. (Though I do have an Arduino and plan to do something with that, too.)
How doable are those star notes? Using motion controls feels like it would be tough, particularly on the more difficult setting (I'm thinking of that one run on Freely Tomorrow on Extreme).
Well, I have no idea about that part since, as I said, I don't have the full version - but they response is quite fast, I'm using the direct acceleration data to check for shaking (as opposed to the default, smoothed value in wminput) so there's no lag compared to the buttons.