[chirp_users] UV-5R question

I have used Chirp to setup several UV-5R units and it works fantastic! However, I was trying to setup a UV-5R with the keypad. I see in Chirp there is a setting for Duplex, but this doesn't appear to show up anywhere in the UV-5R. I have compared 462.600 simplex and 462.600 duplex and see no differences in the keypad menu system. if I was to setup a duplex channel manually, I am assuming I would have to set the offsets, etc., even though they show no differences on the UV-5R. Is there another trick I am missing?

KY