BBK suggestion

[aaronng]

I don't understand either, I'm not involved in other Honda communities so I'm not sure why it's an issue with just track S2000s (never seen it happen on a daily driven S2000)? I don't know if being RWD has anything to do with it as that's really the only difference? Or perhaps, the front hubs are slightly smaller and that plays into it somehow? I dunno - just throwing guesses now.

From my understanding (trying to draw out whatever engineering knowledge that is left in my head after all these years), cracking across the entire rotor like in the photos is usually caused by severe temperature differences across the face of the rotor. To achieve such extreme temperature difference, you will have to be using very aggressive brake pads that will generate that sort of friction (which is what we all want, brake pads with high friction coefficient) and also be able to maintain that friction even at high temperature without fading (which is what we all want as well, pads that work from 200-800 ºC!). So if you go through all the cases where the rotors have cracked in this manner, we should find that a common denominator, which should be the very aggressive brake pads (metallic or carbon metallic), one-piece or two-piece OEM/street/sports rotors, combined with prolonged durations of hard braking (race track with many short-medium straights followed by tight corners, tracks that Honda drivers love).

Locally, I know S2000 people seem to crack rotors faster if they're using R-spec tyres. And in the states, I don't know how much more popular the S2000 is over other Hondas for track use, which may explain why there's more notable cases?

Tyres with more grip will allow more braking force to be generated because they won't lock up or engage ABS. So more temperature generated in the same corner compared with S2000 running street tyres.

Again this isn't to scare away people from using the stock setup. I know plenty of people on the stock setup with plain (myself included) and even slotted faced rotors tracking just fine.
I'd be curious to find out what the OP went for in the end?

My opinion is that the set up needs to match what the car is used for. Most of us track for fun and are not running in competitive events where we are willing to push the car to the limits where a misjudgement results in the car running into the wall. For those who want to push all the way to that limit, then the setup needs to match so OEM rotors or even sports brand rotors will be insufficient.

The combination of the pads, aggressive braking and high temperatures actually necessitate the use of rotors designed for proper racing purpose. Not the regular/mid-range stuff that we all buy.