Not really...I don't know about RCGT but VTA also keeps the motor within limits of the traction of the tires for the most part. Limiting traction alone only creates unsafe cars as people largely will overdrive the tires. The best way to limit speeds is through limiting power...after that you can think about limiting traction.
Besides...I for one don't find it enjoyable to drive a loose car...some people do, some people don't.