Sure there's lots of "SHOULD" in the HIG:
"Note that although the touch and hold gesture is the primary way users reveal the edit menu, they can also double-tap a word in a text view to select it and reveal the menu at the same time. If you support the menu in a custom view, you should respond to both gestures. In addition, you can define the object that is selected by default when the user double taps."
"If you support the Cut, Copy, and Paste commands in your application, you should also support undo and redo (described in“Supporting Undo and Redo”). This is because the edit menu does not require confirmation before the actions are performed and users often expect to be able to undo recent operations if they change their minds."
And sure, they're very good advice - unless you just want get rejected by app store.
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