Soldato
When accelerating from a standstill I do, but that's cause I'll be in 3rd in next to no time, although I suppose it's not exactly resting, but preparing as said.
I was told by my instructor it wasn't a major problem holding a car on hills with the clutch so long as it wasn't for long periods of time!
Instructors are nobody. They're just normal people that happen to have a drivers license and got suckered in by the "earn up to 30,000 a year!!!111" adverts. That's all you need to be a driving instructor There is nothing "advanced" or knowledgable about them at all.