Yes, I seen people tear up cars and even get killed over the years doing that so if I do need to test my trans brake and 2 step the only place mine gets tested is at the track. I find a spot where the car is pointed away from everyone and everything, like into a field or something and then hit the button, go up against the chip and let off. Throttle controllers like you have are very tricky in that they let the throttle go to an idle, then come back up. You just have to remember to let off the throttle and not the t brake button. I have one on my car too.

Thank goodness you got it stopped.