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Can i just add any sounds to that folder and they'll show in Settings>sounds?

You can replace the existing .caf files with your own sounds named the same as the original, but you cannot add sounds and expect them to show up. You can exit the sound.strings file to show the new names and replace the original with the modified file.
 
You can replace the existing .caf files with your own sounds named the same as the original, but you cannot add sounds and expect them to show up. You can exit the sound.strings file to show the new names and replace the original with the modified file.

Ahh right, thanks for letting me know.
 
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