I installed a "Kill" switch, directly to the fuse box. I keep the wing down all the time because I like the way it looks. The warning "beep" sounds off above 90 mph. (A speed when the wing is really necessary)IMO. I seldom drive over 70 mph. ( unless the flow of traffic dictates it). If I get caught in a rain storm at highway speeds, I put the wing up.
The coupe body tends to lift the rear end at high speeds, I don't think the roadster has as much lift as a coupe would simply because it's not a "Fastback" design. Still, I'm sure the wing works for the roadster's too.
Disclaimer: I by no means condone shutting off your wing, do so at your own risk. I'm simply stating what has worked for me for the last 8 years.