It was the last corner of the last lap - hugging the wall damages your car but because he didn't actually need to tap the brakes he just kept on going, round the wall faster than the others.
Perhaps a better idea would be some kind of aerodynamic change which would result in a trapped pressure area on the right side when it is close to the wall. Maybe some kind of concave side.
If it had a real potential to spice the game (like allowing foot hits in volleyball) it would be integrated in the rules with some limitation (for instance you can only do it if you’re way behind)
Not to say it couldn’t happen, just that it’s reasonable to assume the wall is designed to support more force than this.
If it's too effective and everyone start doing it, it loses its charm.
Imagine if in Dota every game only consist of 3 tanks and 2 dps carries because it's too effective, it'll get boring soon.
You can go to the inside, as is traditional, or you can go to the wall and risk it all...