Even Manual transmission MB's need the engine running to ensure the output shaft bearing does not seize!!!
VS tech, please explain how running the engine in a manual tranny car with the gearbox in neutral will have any impact on the output bearing.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.