Never saw anything about a time limit for oil pressure during start in the AFM. We check oil pressure between 55 - 65 PSI and Warning Light extinguished after starter disengage and engine stabilised.
Also, never heard of autofeather being armed on final approach. This would be in violation of the AFM and introduces the possibility of an unscheduled feather in the event of a go-around - especially if one engine spools up quicker than the other.
Stick to the AFM - they used test pilots, we carry passengers.