The good thing with having a loadie around when the muppets are crawling around the poor vulnerable aeroplane is that there will be a witness to the hole put in said aeroplane by muppets motor vehicle. Seeing as the loadie will be flying with the aeroplane then where does overstretch come into this? It may effect crew duty time, but unless muppets render aeroplane u/s then I don't see a problem.
Oh, if you want a brew whilst awaiting the loadies final loading plan then I suggest you take out a thermos. They ain't there to feed and water you on the ground, or can't you be trusted with hot water?