;; This function makes it easier to toggle variables
(defun toggle-variable (var)
  "toggles boolean variable"
  (interactive "vToggle variable: ")
  (set var (not (symbol-value var)))
  (message "%s set to %s" var (symbol-value var))
  )
;; toggle agenda view todos
(defun toggle-agenda-include-all-todo()
  "toggle the truncate-lines variable between true and false"
  (interactive)
(toggle-variable 'org-agenda-include-all-todo)
(org-agenda-redo)
)
(global-set-key [f3] 'toggle-agenda-include-all-todo)
;;;

This is a way to toggle the todos without a deadline or date in the org-mode agenda views

toggle "org-agenda-include-todo"

Lisp