So maybe unity should include this but this would only make playmaker better. How about a 'todo' list? In the hierarchy have a 'playmaker todo list'. It would be a screen where you could type in text. Then maybe under it have a link to a FSM or action.
So let's say you have a bug. You could have a 'todo' set up, type in the info and then drag the FSM or State or whatever over. That way later you'll know you have to go back to fix them.