We taxi single engine with A 319, 320 & 321 plus 737. No problems with either airplane. Taxi in or taxi out. Taxi in with 1 engine running and APU off if gnd power available. Airbus taxi is with number 1 running, 737 is with only number 2 running. Workload is not hard to start the other engine during taxi out.
Ground power is about $70 an hour cheaper than using the APU on the ground