When you have a lot of items in a collection, there's a good use of the sorting function. Default is sorting after when item is published, created or modified. However, at the moment you can't use that sorting function using info from a multi-reference.
Example: A collection of staff members with multiple work titles (e.g CEO and Writer).
In order do use this, you need another collection containing all these work titles, but then you can't use that info to sort staff members after their work title inside the Staff Members collection.