@drMerry - Idolse has mentioned this in the past, and as he is the current "owner" of the source code in terms of holding the dev baton currently I shall leave it to him to comment further.
@Caleb666 - the "Modify ePub" plugin removes these for you. It is only in beta but that is because of a "list of more features we want to add to make it 1.0" rather than because the ones that are there do not work (I've been using it myself for months without any issues). At the moment the latest version is at the bottom of Page 11 on
this thread.