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It is possible to put a dummy jack in the dock so that it knows it's on AC power, as Tony recently described doing, but this has the downside that you're causing rather rough wear on the AC Shensor Shwitch every time you put it in the dock.

I don't believe that installing the jack in the dock, if it's done properly, is any more or less rough than putting a jack in place by hand each time.

Whether it's a dummy jack inserted by hand, the actual AC brick inserted by hand, or a jack built into the dock, it's all just a barrel connector going into the jack. There is also the argument that if you're doing it in a dock, it goes in straight and centered each time, thus potentially being better than a hand-insertion.

No jokes on "insertion" please.