Get rid of track limits. I never want to hear those words again. Put a tire barrier in the corner you don’t want people to cut. automatically sanction people who cut the corner and do it immediately. Add an extra bit of asfalt that drivers have to drive on as soon as the have cut a corner, so they loose 5 seconds per lap when they do that. Be creative.
If you cause a yellow or red flag in qualifying your fastest time is taken away instantly. You are ruining the laps of others and you can not benefit from it imho