I've an idea: speedrun times being changed.
After the castle master's been beaten, add a timer and have it count upwards; the fastest time change the title song.
ASM hacking will be required though since I doubt one can escape the castle in like six minutes and the songs to play might need to be different?
Also, the top five times get to choose the top five weapons for Lunar Shadow Zero (though video times only).
Perhaps make the Confusion Zone route the fastest one?