[Trinket]

With this script you can stop whichever process you want. The only requisite is that all of them are executed by the same group.
In this case "download" is the group.
It's a bit complicated to get it working (If you'r not used to linux) because I wanted to make sure that it was a safe method, and that's why I had to edit the sudoers file (With the visudo command).
But once you get it working, it's really easy to add new processes to the "download" group so that they are also stopped.