With the crowd I fly for you have to have your hand on the thrust levers when the flaps are out of UP and any other time the autothrottle is commanding a large thrust change e.g. commencing descent.
I had one come back to idle when climb thrust was selected at night at Max AUW in a B767. The engine hadn't failed it was an autothrottle fault but it got my attention. :eek.
I personally adopted the above procedure quite some time before it became the rule.
Regards,
BH.