I had the same idea, but thought about it again and it is an interesting modification....
While under acceleration exiting a corner, the weight transfers to the back of the car, which will lift the front,the upper arms move backwards, which then gives more caster "on power", this is what you want.
While under braking the weight transfers to the front, which will lower the front, the upper arms move forward, which then gives less caster "off power", and this is also what you want.......