I have heard that you can get your bm54 re-flashed to have the latest version of the firmware installed and this will allow dynamic routing AND the ID3 tag implementation.

I've only seen it on German forum sites though.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.