When is Mac going to get the PropertyListBox: “Message: Not implemented on OS X yet”. This is going to be such a useful way for users to select responses!
We have this issue on our list:
RH-36572 Python: rs.PropertyListBox fails
and we hope to address it in the Rhino 7 timeframe.
I was just looking at this and it seems like you cannot get there via RhinoCommon yet either.