NicholasA wrote:It's likely that the next organ I'll record will have a choir organ division. Because these divisions are typically on the side of the organ with their sound projecting at 90 degrees to the sound of the rest of the organ,
What a strange assertion!
There have been odd positions for the choir, though. From 1880 to 1910 or so, the positive-style choir case at Christ Church Cathedral, Oxford, was hung on the back of the organ, facing backwards at the west door! What's more, it was Father Willis that did this (and his son HW-II who brought it back to the front).
I would say that if you are recording with full ambience, that you should attempt to find one microphone position that reflects the real-life effect of the whole instrument. If you are recording close, for a dry set, then there should be no issue - you find the best place for each division, or even pipe.
Paul