Developers mailing list
Probably the best place to send your ideas and questions to is the ID3v2 mailing list.
ID3v2 has its own mailing list, <id3v2 AT SPAMFREE id3 DOT org>, intended primarily for software developers and developers of this and similar standards. You must be a subscriber in order to send a message to the list.
To subscribe, signup at lists.id3.org. Confirm the subscription and you're ready to go.
To unsubscribe or manage your subscription, visit lists.id3.org.
There is an archive of the list available and you may want to search it before asking your question.