Ahh, asked about the tow in the other thread - but answered here.
I'm actually surprised you've had so many flats with the R8 on standard rims. Then again, you do drive all over the place. On my BMWs, I had numerous flats with the OEM RFTs - terrible, terrible things. I had 3 flats in something like 18k miles on my previous F10 550. I learned the lesson and just switched to non-RFTs on the current car. But, knock on wood, I've never had an issue with the R8. I've found the Y-spoke (V10) rims to be very sturdy, and both the current PS4S and previous PZeros never gave me problems.
But it may just be statistics for you - drive enough places, especially through areas where debris on the road may be an issue, and you'll get a small puncture. My BMW RFTs wouldn't get small punctures - they were side-wall blow-outs... much more dangerous, and that was due to pressure versus something like a small nail.