No way to stop sound files updating

There's still no way to stop Minecraft from updating the sound files without mods. Adding any custom sounds to the game is impossible up to now, after launching Minecraft, it automatically downloads the default sound and overwrites every changed file.

Easy fix for this problem:
Add a line to the game's options.txt to allow people to toggle sound updates on/off, like this:

soundUpdate:true
or
soundUpdate:false