To my knowledge it's not feasible using any "kosher" methods in the standard transaction. I wouldn't recommend a modification in these times when so many wonderful UI tools such as Personas are available. 
Also I'm not super-smart or anything but usually I can guess the country just by looking at the city and postal code. We sell to 100+ countries but no one ever requested this and we have some very special users too.
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Re: Add column to sales order header partner layout
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