Lots of talk about cones, trucks, people etc. being placed in front of the aircraft whilst de icing takes place. Would it not be simpler to place chocks under the nosewheel which are only removed by the supervisor once all vehicles are clear? That way, even if the crew start to move too soon, they won't be going too far!
Not a bad idea, but I can't just hear it now
"Keptin, I'm givvin her all she's got, but she just won't move!"
Full Power Taxi