[SerializeField] float rollSpeed = 120f;
[SerializeField] float pitchSpeed = 90f;

// Dans ton FixedUpdate
	float rollInput = 0f;
    float pitchInput = 0f;

    // ROLL
    if (Input.GetKey(KeyCode.Q)) rollInput = 1f;
    if (Input.GetKey(KeyCode.D)) rollInput = -1f;

    // PITCH
    if (Input.GetKey(KeyCode.Z)) pitchInput = 1f;
    if (Input.GetKey(KeyCode.S)) pitchInput = -1f;

    transform.Rotate(
        pitchInput * pitchSpeed * Time.deltaTime,
        0f,
        rollInput * rollSpeed * Time.deltaTime,
        Space.Self
    );