I see, I was hoping for the easy answer here. After looking more closely, I think we still have the same unanswered questions mentioned in this thread about how well (if, at all) the PiFace 2 works with that “PiFace” extension option you see in the Cayenne UI.
Tagging @eptak here to see if he knows if PiFace 2 is supported by webiopi/Cayenne and what options should be selected when adding it if so. The last time I tried this, it was not clear to me what Board Number to choose amongst other things.