ActiveScaffoldDuplicate 2.0 has been released, featuring a new feature, requiring ActiveScaffold 4.2.

Built on the new helper active_scaffold_subform_record_actions introduced in ActiveScaffold 4.2, adds support to have a duplicate button on the subform rows, next to the remove button. It will send a request to the action edit_associated, with the fields of the row and a dup parameter. Then, a new row will be added, copying the values from the duplicated row.