Hey wordpress, media manager has some great new features, but one area where it absolutely sucks! Adding a featured image after creating a gallery. In 3.4 and before I could set the feature image, than insert the gallery. Now I insert the gallery and have to reopen the media manager to set the feature image. This extra step often leads to me forgetting to set the feature image.
Also I don`t want to see my entire media library on every post. Perhaps ad a feature to toggle ”view all media” rather than having this the default or only option.