Some improvements that have been put together. The priorities in our view is the same as the numbering provided here (roughly).
1. Povide an option / element to show the grouping as variant attribute dropdowns rather than the matrix.
2. Show volume discounts on the matrix lines (or show the Vol discount link).
3. Allow configuring specific attribute fields per group page.
4. Make the product group matrix line a template that is editable.
5. Increase the matrix limit of 5 attribute columns.
6. Provide a better way to handle the group title. Now it is ambiguous and risky.
7. Provide a better way to handle the group product image from the ERP.
8. Allow multiple grouping fields rather than 1.