Just so you know, the next version will support new, more intuitive parameters. They will probably be:
--server=ID (where ID is the number of the server, starting at 1)
--directory=PATH (where PATH is the path to the directory)
--custom-directory (will display a message box asking for target directory)
--autostart (this parameter will queue files and start the upload immediately)
--queue (this parameter will just queue files)
And to add files, use --autostart or --queue and add the file names as seperate parameters at the end.
The old syntax will keep working for a while, but I will probably remove it in the future.