Lets all be absolutely clear about the engine being started on taxiing. Both Airbus & Boeing along with McDonnel Douglas all
publish single engine taxi IN & OUT standard operating procedures.It can save bucket loads of fuel & time at large aerodromes with long taxyways, especially at light weights.
Whether you like it or not,and your company permit its use, is another matter.
As for the reverser buckets, no problem in my mind.