I can force WinSCP to run 20+ simultaneous SFTP connections without issue by manually starting each file in the queue. The result is a very good bump in throughput and never any issues in stability.
Can you put in a registry key or something that allows us to change the maximum value from 9 to whatever we want it to be? Or a UI warning that pops up when you try to go over 9, but still allows it anyway?
Can you send me an email, so I can send you back a development version of WinSCP for testing? Please include link back to this topic in your email. Also note in this topic that you have sent the email. Thanks.
You will find my address (if you log in) in my forum profile.