I have seen a short video of a retired Finnish rally driver driving an i3 over a short section of road like might be found in a rally, https://www.youtube.com/watch?v=qU-ddacYY5A but this video shows the whole story (both videos in German). https://www.youtube.com/watch?v=-NeoxDcrG0M It appears that a technician changes a setting via a computer program to completely turn off traction control; he does not use roller mode in the hidden menu.