I have my whole Music-Library (~45.000 tracks) all neatly tagged in ID3v2.4 including some special tags, I use elsewhere. But whenever I write something back to the tags it get's converted to ID3v2.3 though! This means loss of data and downgrading from a superior to an inferior version, without even warning the user

So support for ID3v2.4 is an absolut necessity for the next upcoming release.
Until then, how can I prevent MM from updating my tags by mistake, and thus causing loss of data?