It would be very interesting to be able to use the CRUD operations of the DataSource associated with the ListBox, to reflect on the server the changes made to the ListBox widget. CRUD methods are not currently executed after making changes and calling the DataSource sync method.
One immediate need I have is to have the ability to add entries to the collection. I'd like to have an add button in the toolbar. I'd like to be able to add custom buttons natively.