Non-standard values for ID3v1 "Genre" tag

As you may know, ID3v1 doesn't support genres that doesn't appear in the list of the standard values. But there are many other genres in this world than the 148 ID3v1 supports.

So what I thought about is that Mp3tag should set the IDv1 genre to "Other" if the user chooses a genre that isn't supported by IDv1.