I'm a Chinese user, and I really cannot bear the garbled characters on my portable MP3 player (It doesn't support Unicode at all, and so do most MP3 players in China Mainland). I strongly recommend that a checkbox should be added.
I've said it long ago, but I wrongly said it as the problem of ISO-8859-1. Now I've corrected my mistake.
...My English is not so good, so, ...