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Hello Alex, I was about to give you a different answer but as i was typing i changed my mind! So at first i was thinking that you can't do this as it would create duplicate content but then i realized that was wrong cause it is only a link. DUH! That being said, I suppose you could add the "about us" to the drop down but there is no point and it would look silly. I suppose you could do it and show them and hope they change their mind. If they are a tough client then maybe you can change the first "about us" to something else and not link it so it won't do anything and then add the second "about us" to the drop down. Otherwise I would just tell them that it is redundant and can make things confusing for the users. Again, if they are a stubborn client then just simply give them what they want. Other than being confusing for the user it shouldn't hurt anything. Well I suppose it might make for a confusing sitemap, not that people actually use those. Good luck!

Spec work is terrible and undervalues the industry. I say you get what you pay for. http://www.no-spec.com/