Hi,
I suggest you to raise a FER(Feature Enhancement Request) and if it can be accpeted by IBM, you can get IBM official support.
In the other way, I think this also can be implemented by a plugin but all the custom codes are not officially supported.
For the plugin code, you can overwrite the method 'actionBoxCopy' in ecm/widget/layout/CommonActionsHandler.js. But the details logic is in 'actionCopyToFolder'. So it is a safe way to overwrite the method 'actionCopyToFolder' with a new custom method in your plugin code and add your custom logic there. And instead of calling 'actionCopyToFolder' in 'actionBoxCopy', you need to change to call your own method. To avoid showing the Add Document dialog, you can drop to use 'moveFileDialog' and write your code there.
Thanks,
Jason
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