Don't think this is entirely a valid argument - use current regional settings.

Forcing the user to use a tighltly packed scrolling control with inertia is not a good idea. Yes, it might look cool in a demo, but - i think - it's a terrible user experience.

(Try it, enter a date a month and a half in the future)

My phone knows I'm en-us. And it knows to show me dates in the mm/dd/yy format. Other users have their phone display the dates in dd/mm/yy or even yyyy-mm-dd.

If the phone knows how to display it, then it should know what to expect when accepting text entries.