Reply to "Return limiter for brake pedal but not for clutch"

Those are good questions that only the Italian engineers know for sure.  The springs in the clutch pressure plate are the primary source of return.  The counter spring on the pedal shaft intends to return the pedal to your foot in an effort to compensate for slop.  But the counter spring on the shaft overcompensates and there is a dead spot when you press on the pedal and hydraulic system starts to engage.  A limiter like the one on the brake pedal eliminates the dead spot.  It is not clear to me why the brake pedal got a limiter and clutch pedal did not get one.