I found this web page: http://issl.eng.uci.edu/mr-fluid-based-steer-wire-system It looks interesting. Possibly it would solve many problems with current force feedback motor wheels? I'm just wondering whether anybody would, or could, design a force feedback wheel using this technology? I don't know about the cost of making something like that. I was also thinking that an electric magnet with a linear spring, instead of only a motor, could work? I've no idea if it's been posted before.