How to add custom input to InputManager?

"I want to make a racing game! Please help me." With that attitude and the little detail, why should I?

I'm sorry if I wasn't specific enough, I posted this at the end of a long day and was a bit frustrated by the issues, so I will revise and add more detail.

If you are looking to support multiple builds and devices, you should have a look at some examples on how different inputs are controlled.

From the Unity Wiki, check the Update method, where it checks if running in editor then use mouse inputs (else use touch) : http://wiki.unity3d.com/index.php/Tap_to_$$anonymous$$ove_Drag_to_Look_iPhone

This is Platform Dependent Compilation : http://docs.unity3d.com/Documentation/$$anonymous$$anual/PlatformDependentCompilation.html

A more thorough test case would be angry bots. Check the Player$$anonymous$$oveController script :

 // ....
 
 #if UNITY_IPHONE || UNITY_ANDROID
     if (joystickPrefab) {
         // ....            
     }
 #elif !UNITY_FLASH
     if (cursorPrefab) {
         // ....
     }
 #endif

     // ....
 
 // HANDLE CHARACTER $$anonymous$$OVE$$anonymous$$ENT DIRECTION
     #if UNITY_IPHONE || UNITY_ANDROID
         motor.movementDirection = joystickLeft.position.x * screen$$anonymous$$ovementRight + joystickLeft.position.y * screen$$anonymous$$ovementForward;
     #else
         motor.movementDirection = Input.GetAxis ("Horizontal") * screen$$anonymous$$ovementRight + Input.GetAxis ("Vertical") * screen$$anonymous$$ovementForward;
     #endif