Personally
M-mode
RAW
ISO800
ICNR off
Daylight WB
Flash Off
AF off
Hmmmm, personally for me.
Bulb-Mode
Raw
ISO 400, no more
ICNR on
AWB
5D's don't have flashes, so nothing here
AF, is automatically off on Bulb
TC-80N3 Remote, for long exposures.
Leon