Ability to use BR1 WAN port as a LAN port

I have a customer who needs three LAN ports on the BR1. He is using 100% cellular so he does not have a need for the wired WAN port. His request is for there to be a toggle in the interface to allow the current WAN Ethernet port to be used as a LAN or a WAN. This feature is currently available on the Max on the Go but not the BR1.

Can this be added to a future firmware release?