If you teach the deliveryman crafting recipes he doesn't seem to use them, however it would be ideal to be able to use this as a simple way to handle common simple recipes. For example oak wood to oak planks. Then any worker that wants planks can just ask for a delivery and the deliveryman will collect wood from the warehouse and deliver planks.

Yeah, we will have special workers for this, it doesn't make a lot of sense to have a deliveryman craft things.