I just had mine reprogrammed to default to off on startup.
All new Euro cars are getting this feature. The M5's problem is that the Stop/Start isn't a good example of the technology. My E63 also has S/S and it is fast, smooth and unobtrusive. The M5's restart is slow and comes with an unnecessary rev flare. My dealer turned it off for me at no charge. I can enable it at will but can't see myself doing this.
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