With penalties turned on it's a bit harder to tell intent. The ghosting algorithms have always been sketchy at best, but generally downright useless in helping to determine who did what, where and why. With penalties turned off, it will make it much simpler to tell when someone has used that start button for advantage. This carombolage you speak of, is this a driver behind trying to ghost through the mess? If so, that is against the rules as well. All cars are to be treated as solid at all times.