I understand that, when shift-clicking items into the jumbo furnace, it tries to put all fuel items in the fuel slot.

For example Spruce Logs

However, i also want to turn my spruce logs into charcoal. If my fuel slots are all full of buckets or other stuff, and i shift-click my Logs into the furnace, i expect and hope it goes into the input slots just like a normal furnace. ( A normal furnace will shift click logs into the input when fuel is filled)

For example: