At the bottom of the Write menu there is a “Edit Duration” menu that includes “Lengthen/Shorten Duration” and “Double/Halve Note Duration” that appear to do the same thing.

Double/Halve Duration seems more accurate than Lengthen/Shorten Duration. Wouldn’t it be clearer to remove the above command and assign the default shortcuts to “Double/Halve Note Duration”?
Lengthen/Shorten works differently for objects like hairpins, playing techniques and lines, where it will move them to the next/previous note.
You can of course change the key shortcuts to suit your workflow.
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@benwiggy Get it, thank you!
Thanks for the clarification. However the words used in the menu are confusing when the user is deciding which option to use! 
David