I think it's important to say that "popping" the clutch isn't what people are doing. It's much more subtle than that.
Maybe you're only using the common expression and not the technique itself, but "Popping" the clutch will impart more shock to the engine/drivetrain components and is probably uncomfortable for the passengers.
Even "bump" starting is a misnomer. As Tasdrouille pointed out, done well, restarting the engine with the clutch should ideally be imperceptible to anyone riding with you.
See
http://ecomodder.com/forum/showthrea...gine-1141.html
PS - Tas - amazing video. The grip of those front tires must be phenomenal!