Shut down number 2 taxing in (319,320,321) as soon as the APU is available and not going to a fixed jetty (319 only). Only have to turn on the yellow pump so not exactly complicated, quite agree that a heavy aircraft and lots of stopping is not ideal and I normally don't shut the engine down if I think that is going to be the case. It is probably the most effective fuel saving you can do on shorthaul to be honest, with longish taxi times (AMS 18R for instance) you can save 100kgs on one sector, hard to achieve that any other way.