Look for this in system_direction.cns:
[State SAゲージy軸];数値を小さくするとゲージは上の方へ移動します
type = VarSet
trigger1 = 1
var(17) = ceil(gameheight-12)
[State スタン];気絶のあり・なしを設定します
type = VarSet
trigger1 = 1
var(20) = 1 ; 0:OFF 1:ON
Set var(17) to a large number (like 800), and it will move the super gauge off the screen. Set var(20) to 0 to remove stun entirely (which should also remove the stun gauge).