Hi (this is my first post),

I'm trying to get a visual hint that a certain TODO is unscheduled, so that
I can immediately see this when I go through the outline during regular
reviews.

My first strategy was to try and add a font-lock hook to achieve this
multiline font-lock behaviour:

See
http://paste.lisp.org/+2IFV

However, this failed. I presume my added faces are being overwritten by
org-mode since the hook is being called before org-mode writes the faces.
What could I do about that?

My second option was to write an interactive function:

(defun org-mark-unscheduled ()
  (interactive)
  (save-excursion
    (goto-char (point-min))
    (while (re-search-forward org-complex-heading-regexp nil t)
      (let* ((state (match-string 2))
         (state-start (match-beginning 2))
         (state-end (match-end 2))
         (scheduled (org-entry-get nil "SCHEDULED"))
         (deadline (org-entry-get nil "DEADLINE")))
    (when (and (not scheduled) state-start state-end)
      (overlay-put
       (make-overlay state-start state-end)
       'face 'org-todo-scheduled))))))

This works quite well but I get the nagging feeling I'm going about this the
wrong way. Surely, being able to see which items are due for scheduling is a
common task? (I do note that I could search for them, but then I would not
have the context of the actually scheduled tasks in the same view...)

Regards,
Martin