Speaking on that, it can be overdone. These cars from the factory arrive with under-steer bias, meaning the front end will push in a corner.
There is a point at which the balance of the car goes from under-steer to neutral to over-steer bias. As you add bars this changes the behavior of the car to more neutral and perhaps beyond. I am not sure where this would occur, but I myself with the TRD sway bar have been in a situation many times where the rear end lost traction and stepped out inducing an over-steer scenario with good tires too. In the dry, this was only under specific aggressive turns with in a lift off over-steer combination which I can replicate with some effort. In the wet I can get over-steer without throttle manipulation and in the snow and depending on the road surface I can get it to happen when I want and it is quite easy.
I can only imagine that with the addition of more bars this could occur even more easily, well for me anyway as I know to do it. There have been cases with other cars where people have had a short amount of wheel time after the bias change and found the rear end stepping out on them when they were not expecting it to, so use prudence and wisdom.