I've thought many times how useful it would be to have a sorting feature added to the champion selection screen to pull up custom lists of champions so that considering your selection would be made a hundred times easier and faster. You have the name search feature already, however I'd rather pull up a list of all of my AP Mids or Toplane tanky champions with one click.
The categorizations would be stored locally, and allow you to give them customized names.
This way, what makes League so golden (the ability to allow users to define the game and how it's played) is not blasphemed, and we get a better organizational system for faster and more thoughtful choices in champion selection.