Feature request: option to deactivate builtin screen when monitor connected

This is a feature request for laptops, or rather for the Air specifically. To see why it might be a good thing, see this thread:
http://forums.macrumors.com/showthread.php?t=449778
I'd like a checkbox in the display preferences to deactivate the internal monitor when an external monitor is plugged in. This would save load on the Air's GPU and reduce heat while using an external monitor.
Users of the regular Macbook might want this as well.

Apple doesn't monitor the forum for feature requests and the like. It's just for user-to-user help.
Also note that this feature already exists: all Mac laptops sold in the past few years, including the MacBook Air, can be run with only an external monitor. It's called closed-lid mode.
http://docs.info.apple.com/article.html?artnum=86286
http://docs.info.apple.com/article.html?artnum=307315
If you then want to open the lid to increase cooling, you can. Once the external display is attached, the internal display does not come on automatically when you open it.
If you still want to give Apple feedback on another issue relating to the MacBook Air, the link is:
http://www.apple.com/feedback/macbookair.html

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