During re-structuring the document storage, multi-seletion of documents would be useful.
You can actually make a multi selection of documents today. Click into the area to the right of the document/folder names. Hold down Ctrl or Shift if you use PC and select all the documents you wish to move.
We are right now updating our service and what will be new in mid autumn is the possibility to mark several items in the list and drag and drop them to the new location instead of only using the copy and paste feature.