Is that what you are saying? I guess I don't see why you would ever need to put the switch in "Store" mode if that were the case.
The only reason would be to reduce as much 12v
parasitic load as possible so that the battery is not being depleted by say something like a light or fan left on.
Let me say, I'm not advocating one method versus another only stating that's the way it works when the converter/charger is wired between the battery bank and disconnect switch. Obviously, there's no pat answer to the question the OP was asking. The correct answer is, "It depends on how your converter/charger is wired."
I think the lesson from this discussion is regardless of what the manual or dealer tells you every AS owner owes it to himself to personally check to see if their converter/charger is wired before or after the disconnect switch. By knowing which it is, the owner can know for certain the implications for the switch being on "Store" or on "Use" with the goal being to keep the batteries as fully charged as possible and as frequently as possible.