Remove the "Command + D" when within a document. The reason for this request is "command +F" is a function I use often. Because of the proximity of D and F on the keyboard, I often mistakenly duplicate an entire book, sometimes containing thousands of pages and notes and imported pictures. Another fix would simply adding a prompt "are you sure you want to duplicate all 1xxx pages?" then have to click yes. It locks up my computer when it duplicates. Thank you!