temporarily un-ignoring scheduled tasks in global todo list

[Christoph Groth <christoph@grothesque.org>]

Hi,

I like to have

(setq org-agenda-todo-ignore-scheduled 'all)
(setq org-agenda-todo-ignore-deadlines 'all)
(setq org-agenda-tags-todo-honor-ignore-options t)

but sometimes I would like to search for some item that I know that is
scheduled somewhere into the future.  Or I want to verify whether some
item exists.

What would be the best way to temporarily show all tasks?  I am thinking
of writing a function that calls org-agenda with the above variables
temporarily set to the default values.  (That should be possible in
elisp, but I do not yet know how.)  Is there a better way?

Alternatively, one could always show all items in the global todo list,
but somehow mark the already scheduled ones.  Orgmode does not seem to
allow for something like this out-of-the-box, though.

Thanks,
Christoph