I have no interest in a hex editor, but I would REALLY like to be able to view "special characters" in hex or decimal rather than as mnemonics, e.g.  rather than [TAB],  instead of [CR], and so on.
Is this already a feature in Notepad++?
Is there already an add-on that does this?
Nope, and it is not a feature in Scintilla either. Please ask that project for it, as it is the Scintilla ccomponent which draws al characters, including these non-printables.
If they choose to do so, then a subsequent upgrae of Notepad++ will have the feature - openly in UI or via messages/macros/scripts.
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