My guess is that there is most likely a open and closed limit switch to tell the computers that the spoiler is either up or down. If you open it manually then close it, there is a beep to let you know it has fully closed. I would think the open limit switch would tell the computer that the spoiler was fully opened and let the car go faster than 57mph. If you wanted to have the car go faster than 57mph ( and who doesn't) you might be able to by pass the open limit switch, disconnect the motor and keep the spoiler down at any speed. I wonder though if this were done and for some reason you lost control of the car above 57 mph, if your insurance would pay for the damages?

I actually like the spoiler going up, and unlike others that have a complaint about the noise it makes , I don't hear it going up or down. My wife likes it to go up as well and has sometimes had to look behind us to see if it has gone up.