I'm afraid answering those questions is beyond me, as I'm not this experienced with the Wiimote. What you get are not the raw angles and accelerations, but preprocessed values. I don't know what the preprocessor in the Wiimote precisely does, but maybe there are forums where those questions are discussed. Mostly you'll have to experiment yourself. A Wiimote+ will work I suppose.

We plan to support other console 3D entry systems as soon as they are established and libraries for them come out.