The Shift-K combination is potentially hazardous for users who switch back and forth between, say, an InDesign document and a PDF while making proofreader's changes. Typing anything with just the Shift key as modifier can lead to unintentionally typing a character into the InDesign document — if the user doesn't remember to activate the PDF document window first. When there was a visible checkbox in the PDF, that couldn't happen because the user had to click in the PDF window to check the box. Please bring back the checkbox. And maybe switch the checkbox modifier key to a safer one. (Why does Preferences use Command-K? How many users access preferences so often that they need an easy command key for that?
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