In addition to what I've described above in #7, I've worked on dynamic adaptation of the dialog height to a size that shows the most options. I've also added a separator type that simple shows a line between controls and has an optional title:
{
"type": "separator"
"title": "Optional Separator Text"
}
If you're looking for a visually more distinctive header text, I've also added a heading type that creates a bold text control with different background:
{
"type": "heading"
"title": "Header Text"
}
This is now available with Mp3tag v3.21h.