One of the great features of Scrivener is the binder, in which you can dump research, web pages, pictures, and video. When doing legal research I will often collect case decisions as individual research assets. I like to insert little symbols into the entries to help me remember. An arrow up for a positive case or down arrow for a negative will suffice. This could be used for other writing applications as well. To insert the symbols, activate the Character Viewer in the Language & Text/Input Sources preference pane and you are good to go.