bug#36826: 26.1; request: add variable value editing feature to the *Help* buffer

[Juri Linkov]

> I mentioned `set-variable'.  But it is only for user options.

I use such advice to workaround this restriction:

;; Allow set-variable to set all variables, not only customizable ones:
(advice-add 'set-variable :around
            (lambda (orig-fun &rest args)
              (interactive (lambda (spec)
                             (cl-letf (((symbol-function 'custom-variable-p)
                                        (lambda (v)
                                          (and (symbolp v) (boundp v)))))
                               (advice-eval-interactive-spec spec))))
              (cl-flet ((custom-variable-p (v) t))
                (apply orig-fun args)))
            '((name . override-custom-variable)))

But I agree with Michael this should be allowed only to developers.