#1 Drag and Drop onto current copy => same dest.

[Anonymous]

Functionality similar to that offered by KillCopy: If
copying files from selection A to location B, by
dragging a selection C onto the dialog showing the
status of the original copy, selection C is then
queued onto the copy process to location B.

In other words...

Begin copy from A to B.
Dialog appears showing progress of this copy
Select other files etc, drag and drop onto the dialog
These files are then queued to be copied to Location
B, behind those of selection A.