Please add me to the list of those who'd like to see the ability to automatically upload and download multiple download threads, and uploads as well.
I often have occasion to upload or download several hundred files to or from one folder on a server. If I manually select a few files at a time and start the transfer for each of those groups so I have, say, 16 sessions running at once, I max out my upstream or downstream bandwidth. The process is then completed much faster than if I select all 300 files, start the transfer, and let them transfer one at a time.
I'd like an option to set the maximum number of transfers that will start at the same time automatically.