Wow great find! It's amazing now many factors control the idling and stalling of this bike (or any bike I assume).
Mine was bad from the factory but the issue turned out to be plastic "pebbles" inside the gas tank from when it was constructed. They would randomly block the fuel outlet/filter.
Many have been the hoses, some ecu reprogramming, others fuel pump/Cdi but this is the first idle actuator I've heard of.
Can you edit your title to indicate "solved - Bad idle actuator"?
I ask this because there are a milion stalling threads and most are ignored by people, yours has great info in it and videos to boot!
08 BMW F800ST, 09 BMW F650GS