Yeah, it is. You should probably watch Formula 1, your profile picture suggests that you would like it.
They certainly are unpredictable. I think that's not a particularly good thing for what is functionally the rules making body of an online sport. People aren't going to be enthused about driving in a series where they have to try to predict what the rules will be in the future.
Frankly, I think they should have just invalidated the whole round. That's pretty unexciting for players too, but at least it's consistent.
You can. You'll notice that the game allows you to steer your car in whatever direction you want.
You will be penalised (probably, Polyphony's system is pretty whack sometimes), and you may find that other drivers behaviour towards you is also altered in ways that you may find difficult. But if you find it to be consistently faster, then you probably should.
More likely you'll find that it causes people to actively target you for retribution, and the erratic driving required to do so puts you at greater risk of accidents, spins and off-tracks. So your average finish is probably going to be worse than if you drove hard but fair. But if you think this hyper-aggressive style is faster and the only reason people aren't doing it is courtesy then you're welcome to try.
You may also risk infringing on the "no unsportsmanlike conduct" rule that Polyphony explicitly has. Technically pretty much anything can be considered unsportsmanlike conduct if you bend the definition enough, but something like intentionally ramming other players has a lot of historical context to support it being viewed as unsportsmanlike. Whether Sony or Polyphony would care enough to take any action, and what action they might take would be up to you to evaluate.