Spy Hunter NEEDS 4 buttons at very least. 5 if you count the weapons van... but you can get away without that as its just used to start the game.
It also Needs a 2 way shifter - that is seperated from the wheel. As there is no way you can keep your hands busy with all those buttons, and then try to toggle the shifter with another button. It gets too frantic, and you end up making too many mistakes that way.
Buttons:
- Machine Guns
- Smoke
- Oil Slick
- Missiles
- Van (start)
- Shifter Hi/Lo
I think from these replys.. that its probably better to just produce the Yoke instead. Or produce a yoke and a 360 degree wheel - and not combine the two types. The reason is, the complexity, cost, functionality..ect. People really want a nice yoke.. and they are much harder to find, as well as very expensive to purchase.
360 wheel games can be played just fine with spinners.. or you can grab them fairly cheaply on ebay. It would be nice to have a new quality 360 wheel as well.. but ,the cose may be too high to justify. If one were made, it should be high res, with the option to reduce the output to lower res just in case there are games that
do not function well like that. Many 360 games used a gearing system to increase the resolution.. but I know some that did not such as the Supersprint games. (i love them

A yoke should have 4 buttons like the starwars version.. and have each able to be mapped to different buttons. That should be great for most driving games, even Spy Hunter.
A pedal input port should be added to the thing.. so one can hook analog pedals to it for driving games.. as using the vertical axis for gas dosnt control very well.
Its got be built very tough to be able to handle the side to side forces from slamming the wheel at its extremes. (use heavy duty rubber bumpers)