I think that any "home made" system is going to be difficult to get working 100% ALL the time. You'll need loads of extra sensors for steering input, vehicle speed, throttle position, yaw rate etc etc Mucho headaches!

A Passive system where the various parts twist torsionally would probably be a safer bet. On a permanently RWD car, I can't imagine theres a need. A better suspension geo will do 90% of what you're hoping to achieve. A better turn in, and a more stable rear when accelerating out of a corner. Something Im led to believe Cossies arent very good at.

On a FWD car something like a RST will need a complete assembly. Maybe retro fitting a Pug 306 trailing arm will do the job?

Good thread btw. Far too many on here are about straight lines