I'm not sure if it started with 10.5.6 or I missed it earlier, but suddenly my System Preferences has a separate preference for Trackpad, rather than having that all in the Keyboard & Mouse preference as a separate page.
That's definitely new.
Apple also removed the battery optimization setting that was in the drop-down menu of the battery/AC icon. You now have to open the Energy Saver preferences to customize it.
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