Since I couldn't get QtCreator to work, I've attached a photoshopped version of the proposed Metadata Editor dialog box changes.
Since it's hard to predict which of the new metadata elements will actually be used, I'd suggest implementing only minimal changes:
1. I'd add a Number in series text box right of the Title text box that would be saved as
group-position.
2. I'd add Refine... buttons right of the Title and Author text boxes.
For example the title Refine... button would open a dialog box with the following items:
- Title: text box
- Title type: drop-down list-box with the following entries: main, subtitle, short, collection, edition and expanded
- Display sequence: text box or drop-down list-box (this control could be omitted if the display-seg value is automatically set whenever the arrow buttons are clicked)
- Add: push button
This dialog box would also display existing title values in a table like the original Metadata Editor dialog with the same controls (copy, remove, up, down etc.).