Not an expert but my take on this would be if you know you going to attempt a manual start then leave it at IGN.
If return to gate, turn it to NORM (
).
Also. If I got a hung start on eng 2, does this mean eng 1 has to also be started by manual start or..?
Depends what caused the hung start on ENG 2 i think. My take is you do not
have to.