Allow individual interfaces to be "disconnect mode"

[ghost]

During initial configuration of a system it is common to not have all the required hardware available. As hardware arrives some interfaces become real while others need to be stubbed or simply don't exist. It would be nice for script development if the real interfaces could really interact with hardware while other interfaces could act similar to how the script "disconnect mode" operates. Perhaps a new keyword under an INTERFACE called DISCONNECT or SIMULATOR_MODE or something. We would have to ensure that there is visual distinction to the user to indicate this mode is being used so there isn't confusion if this mode is accidentally enabled.