I'm beginning to think that the Wii remote really isn't a good steering wheel the way that companies are trying to use it. Simply holding the wiimote on each side feels too loose and flimsy. It doesn't really translate well into the game either. Look at the new Need for Speed videos of gameplay: http://media.wii.ign.com/media/910/910242/vids_1.html
that doesn't look easy and they player is having trouble.
Why not have the nunchuck be the left hand on the steering wheel and the wiimote be the right? Maybe that with a wheel accessory that locked them together would be the best.