As wingracer well pointed, on the rear end we have a dynamic change of toe angle. This change can be adjusted to zero by changing the orientation of the toe link arm.
The camber can be adjusted only by changing the arm, but you don't have the problem anymore with adjusting equal camber left and right.
Roll center can be adjusted with shims under pivots and shims under the ball joints that keep the suspension arm fix to the chasis. Also antidive and antisquat can be adjusted with shims.
The ball joints are fixed in material at a certain temperature, with a certain force and if you try to take them out you will damage the part. In tests ( more than 10hours on a model) we never experience any faulty in this balljoint system.

So far tha car took 5th place at Juniors at Romanian National Championship, but I am very confident it can do more in the near future.