It would be nice to have an option on the transfer dialog (either Copy, Move or any other transfer action) to Cancel after the current file (instead of aborting a file if it is already started)
Sometimes while doing a backup of folders with large files you find out that you don't have time to copy the whole folder. But if you are in the middle of a 4Gb file (e.g. email folder) you would prefer that the current file was completed and you could leave the rest for another time.
I think this is probably not difficult to add...