3/ for smaller 737 ops in quiet open un-congested aprons ( with steps ) with a serviceable RUNNING APU I don't particularly see the serious problem if you cut both 60' before the stop point.
Silly and pointless? Maybe..........Dangerous? No.
Not dangerous?? And if the APU dies when the electrical load is suddenly put onto it as the main engines are cut?? (It happens).
Are you sure you're an airline pilot?