There’s nothing dishonest about it. It’s guys finding the fastest possible line around the track. Which happens to include driving over some kerbs etc. You are free to drive the same line if you like. And honestly it’s really not that much easier as you can still dirty the lap if you don’t hit the cuts just perfect.
One other thing. You could put up barriers or whatever you like. Wipe the leader boards and start over. But I promise you,those same guys at the top now will be at the top with the new barriers. Not because they are “cheating” but because they are extremely fast and know how to find the fastest way around the course no matter what the track set up is.