Amiga floppies were designed to daisy chain. There's no need to mess with jumpers.
I do recall some issues with the A2000 wherein the first external floppy became DF2: instead of DF1: and that could be annoying if software assumed it should look for DF1:. There was a jumper or something on the A2000 mobo or a line to be snipped ot deal with this. It's been nearly 20 years so my memory is vague.
