Hi
my opinion and experience is:
If you have a single drive at the cable, jumper it as Master
If you add a second drive to the cable, jumper it as Slave (there are some old drives where the Master-drive has to be jumpered explicitly as "Master with Slave present")
For the cable-select jumper position, you need a special cable where some wires are twisted (somehow simular to a floppy-cable). Never seen such a cable and never seen a drive jumpered as CS. If you experienced that the drives are running even if they are jumpered wrong, you could see how tolerant the modern drives are, nevertheless they are jumpered wrong and may produce unpredictable errors (e.g. bus-hang);-)
Noster
