From an electronics standpoint I'm sure you can buy a variable resistor or potentiometer and you could hook inline to the wire that runs the spoiler up and down and change the speed the computer sees.
Then again it's probalbly a digital signal and that won't work. Somebody who is an electrical wiz should have a look at the book and let us all know.
I agree there isn't much need for it over that speed. If you wanna raise and lower it easily get the switch kit that moves it to your dash.
http://cgi.ebay.com/ebaymotors/986-996-BOXSTER-CARRERA-REAR-SPOILER-CONTROL-SWITCH-KIT_W0QQitemZ8072686510QQihZ019QQcategoryZ50459QQs sPageNameZWDVWQQrdZ1QQcmdZViewItem
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