If you want a user selectable option, how can u leave db alone? You have to save the user's selection somewhere in your database. You would consider adding a new field to user table if you didnt apply my solution and it would require much more hacking since you need to form a interface for your users to populate this field. Adding a new profile field just saves you from this trouble.
Bottom line is, you can not have such a hack without touching your db.
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