AWA explains that there are no immediate plans to add a campaign scheduling feature.
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Wired Suzanne, I am not aware of any plans to include a 'scheduling' feature in the immediate future. However, I will happily forward the suggestion. Consider it done!
Please know that advertiser feedback is taken very seriously at AdWords, and you can always make suggestion by writing to email@example.com.
I have also gotten in the habit of forwarding suggestions posted at the WebmasterWorld thread (hint, hint) below: