GAME SUGGESTION: Sticky Runes and masteries
It would be extremely useful if rune and mastery selection was tied to a champion selection, and using a particular set of runes and masteries becomes the default the next time that champion is selected.
Team builder is the obvious use case for this, at least, where you need to select a champion and position first, then your runes and masteries appear below. If, for example, I load into team builder and select Sivir, bottom lane and ADC then it should load up the last runes and masteries I went into a game with as Sivir automatically.