Is it possible to prefix the files that are being downloaded? (similar to rsync) For instance if fruit_banana is being downloaded, it will show as fruit_banana but the transfer is not completed. (It would be nice to prefix it with something to differentiate between completed or not completed files)
Eventually found the answer:
The following extra parameters are needed:
set xfer:use-temp-file yes
set xfer:temp-file-name *.lftp