Hmm how would I control SFIV?
Ryu and Ken:The Hadoken I would put wiimote and nunchuk to the side of my hips and push forward to let it fly.Depending on how fast I go from hips to full extension determines speed. The Dragon Punch you would do a uppercut motion with the wiimote.Their rotating kick you would start the wiimote in front of you and move it in a circular motion. If you want to move to the left then you would move it to the left then make it back to the original position. If you want to go right then you move it to the right till you return to your original position.
Guile:
With his sonic boom you would start the wiimote and nunchuk on opposite sides and then bring them together.Flash kick you would start the wiimote tilted down then you would bring it up.
Chun Li:
Her fireball would have the wiimote and nunchuk above your head then you would move it forward. Just like Ryu and Ken speed of movement dictates speed of fireball.Spinning Bird kick you would do a lasso motion.Lightning Kick you would put the wiimote in front of you with the buttons facing up and you would rotate it in a circle.
Edmond Honda:
Hundred hand slap is the same as Chun Li's Lightning kick. You would move E.Honda forward and back with the analog stick.His Banzai Torpedo would have you have your hands beside you and you move forward both hands.
I can't think of anymore.
Flames why would it not work?
That's one way to do it. I imagine controlling the speed of fireballs would work well in this method(motions controls should have variation like in Wii Sports instead just one pre-made animation for each move).There's a lot of other things to take into account such as supers and assigning the 6 attack buttons that need to exist regardless of special moves. It would be good if it had lots of control types to choose from.
One way to do it would be to make it like the genesis version of Street Fighter 2 without the 6 button pad. In that game the 3 buttons toggled in between punches and kick when the player pushed the start button. This might seem like a bad idea but remember it would be easier to switch the B,C, and Z buttons from punches into kicks because you wouldn't have to take your hand off the buttons or d-pad to switch. A switch could be made by pressing the analog stick(because your other thumb isn't doing anything otherwise) or by shaking the remote or nunchuck. This control type could even be combined with motion control for specials and still let you do specials with quarter circle and charge commands. This could happen with in the same control type.
Another way to do this to make it a 2 button game(one button for punch, one for kick) where if you swing the remote fast while attacking you do your strongest attack and if you swing the remote slowing you do a medium attack, and if you don't swing the remote you do a quick weak attack. This can be done only using the remote or with remote/nunchuck combo. If you use the remote only you'd hold the remote sideways and play it like a normal Street Fighter game except with moving the remote. Specials would still be quarter circle and charge moves.
If you used the remote/nunchuck combo you could use the analog the determine the strength of moves. For example players would use the B trigger on the back of the remote for punches and the C or Z button on the back of the nunchuck for kicks. Then by pushing up on the analog players would make any punch or kick turn into a fierce punch or kick. By pressing down on the analog it could make kick and punch into light attacks by doing nothing they are medium attacks. This method could also be combine with motion controlled specials.
The last idea I had was for Capcom to provide a small piece of plastic with the game so players could make their own virtual arcade stick with the remote acting as the joystick. This frees up the A button for use because the D-pad wouldn't be used. After that happens the game will have 4 buttons so the final 2 buttons could come from press a combination of buttons for example:
A standard arcade layout looks like this:
1 2 3
4 5 6
with the 3 and 6 buttons being the fierce attacks. What if pressing 1 and 2 at the same time caused a fierce attack(same thing for 4 and 5)? That would mean the game only needs 4 buttons.
The reason I believe a piece of plastic is necessary to make this virtual arcade stick because you wouldn't want to press the remote vertically down on a surface with the nunchuck attached. You could do this with 2 remotes per player but that would too expensive for some people.
Edit: I just tried to mimic this control to see what it would be like and it wasn't as comfortable as I hoped. Shortly after that I noticed that if you flip the wiimote upside down so the pointer is pointed toward the ground it becomes a lot more comfortable as a joystick. The A and B buttons would not be use in this setup but instead the "1" and "2" buttons. A big advantage to this is you wouldn't need a piece of plastic to make your virtual arcade stick.