Using org-capture inserts the captured note directly into the target file, which allows the user to save with C-x C-s what they've typed incrementally and then continue adding to the note. In contrast org-add-note captures the note in a temporary buffer which can only be saved by creating a temporary org file that has to later be manually deleted. I would like the option for org-add-note to either behave like org-capture or, if that is not possible, to have the option to associate a temporary org file to the note and have it be deleted on C-c C-c and C-c C-k.