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Isn't this the same drum that has been beating since the days of desktop applications... for those old enough to remember when applications where actually run on a desktop OUTSIDE of a web browser ;).

Actually... even past the dark ages anyone remember the popularity of webpagesthatsuck.com?

No matter what the technology someone will need to do something that is out of the bounds of the 'stock user interface'. So you either account for it by allowing everyone to do anything or you limit it...

http://www.useit.com/jakob/constbook_preface_2nded.html