Just a caution on 3) - there is an option on the 3/4/5 (not sure about NG) where HDG SEL is automatically engaged with TOGA on the runway. Flew a 300 with that for a year - which made conforming to the Ops Manual "no HS below 400'" a challenge
. Just glad I never flew a line check in that one.
4) Closing both start levers enables an engine which may be 'locked' with a surge or stall to clear the flow pattern.