Cruise control maybe. a sunroof totally takes away from the purpose built car.

I would say sound deadening more than cruis and I don't miss the sunroof from my GSR one bit. Actually glad it is gone. more head room for a helmet and no sun in my face during mid day.

Disclaimer: I hate convertibles and only like sunroofs in the evening and at night. If I owned an S2000 I would remove all convertible mechanisms and put a hard top on permanently. I would likely even seal the targa top on an NSX