Just heard back from them (good service!). Apparently on Mac, the accepted types of device are hard-coded. I'm not sure when it will be fixed, but probably not for a while so for now the symlink is your best bet.
I've created a bug for it if you want to follow: https://code.google.com/p/chromium/issues/detail?id=334698&thanks=334698&ts=1389806409
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