I like the new iOS 7 theme in GoodNotes 4, but it has WAY too much glaring white space in the "bookshelf" view and in the menu bars. This is fine during the day for most people, but during night or in a dark room it can cause eye strain which inhibits productivity. For people like me with sensitive eyes, it'd be wonderful to have a "dark/night" theme that could be toggled on or off or even automatically activated based on ambient light. The music app "Ecoute" has a perfect example of this functionality. For me, this is the missing feature that would perfect GoodNotes.