I suggest not turning the nannies off unless you have good experience with the car and how to recover, if you are new or inexperienced it will catch the car before you realize you lost it. The RS's nannies usually fairly generous in terms of the slip angle they'll allow, especially in the track and drift modes.
That said, as you gain experience they do become a hindrance, stepping in when un-wanted, once you get the to level where you can recognize the rotation of the car, and expect it to happen, then its time to turn the nannies off and begin exploring both yours and the car's limits.
Often times I'll forget to turn them off, and just as the rear rotates the way I like it, and I feed in opposite steering, the stability kicks I and straightens the car out or takes power away, ruining my fun.
That said, as you gain experience they do become a hindrance, stepping in when un-wanted, once you get the to level where you can recognize the rotation of the car, and expect it to happen, then its time to turn the nannies off and begin exploring both yours and the car's limits.
Often times I'll forget to turn them off, and just as the rear rotates the way I like it, and I feed in opposite steering, the stability kicks I and straightens the car out or takes power away, ruining my fun.