As someone using a controller, I can tell you that is false. My controls are a bit weird but they work well enough for me.
Left stick - WASD
Right stick - Mouse
Right Trigger - Shift
Left Trigger - Space
A Button - Right Click
B Button - Left Click
Y Button - F
X Button - E
D-Pad - Up: H, Right: O, Down: I.
Even with the six buttons, it wont matter. The jutsus have nothing to do with it. There will be many other controls, and most of the entire keyboard used. So, in addition to having limited jutsu, you will also have limited maneuverability. In the current SLO version, there are a lot of things that are difficult for me already. Lining up with enemies for jousts is extremely hard because the left stick isn't perfect. Running is STUPID hard because I have to hold the right trigger + move both analog sticks up. I know I don't have the most efficient controls, but they're still controls. People using keyboards, however, can move their mouse at different speeds, therefore allowing them to turn their camera however they want, while my stick is set to a constant sensitivity. They can also move much more fluidly. In reality, you aren't going to win against anyone with a controller in the final version.
I know you meant to suggest a way that a controller could be implemented, but it really can't. It is not "easily possible" to use a controller and win. You were not able to prove your point either. How many people are going to get that controller just for one game when they have a keyboard, anyway?
Sorry if this came off as rude, it had no intention to be. But there are no valid points whatsoever.
Also, you'll never beat Xen because he is baby jesus.
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