If you pay some attention, you will find that the rotor is quite noisy (and by the way ... efficient), but noisy just until the mainspring is fully "charged".
From that point on, the rotor is hardly audible.
As Clavi said, it is not much of a problem to remove the rotor to "convert" it to a manual wind, and the power reserve is adecuate for that. In some watches, the winding gears are not made of steel, so manual winding would cause premature wear. From the very few pictures I have seen of the 956, they appear to be steel, so not much problem there it seems(except from warranty issues, etc).
I find a certain charm in the winding clicks, and don't see the point in the conversion, but anyhow, check the rotor noise when the watch is fully wound, and I bet you will see that it is mostly absent.
Saludos,
Tony