Going back to the shutting down engines thing...
Shutting down both engines as you trundle the last few feet on to the stand can't be a good idea. It's a bit pointless for fuel savings, and distracts you from the all important task of not hitting other vehicles on the apron, and indeed, the terminal building itself - that would be mighty embarrassing!
Nothing wrong with shutting one down on the taxi in IMHO, so long as the aircraft is light enough to get around on one/two/three (delete as ap't!) without blasting half of the ramp away. Saves fuel, noise, brakes. Seems like good airmanship to me, but does anyone else think differently?