1/ I haven't ever done it and won't
2/ I never suggested being daft and doing it in a wide body entering a confined area to an Aerobridge!!
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.