This is only what I think and not what I know from experience.
Body roll in cornering is basicly centrifugal force. Weight is transfered from one spring to the other. Stronger springs would have about the same effect as no springs.
Stabilizer bars limit the body roll by transfering the force from the spring which ends up in the frame. But wait, there is no frame, it's a unibody. What I'm getting at is a strong stabilizer bar or pair of bars would flex or twist on the car unless subframe connectors are also added.