To answer my own question, the MiniLab 3 does not have a knob that you can assign to scroll through all the program changes. Perhaps this could happen in a firmware update but seems unlikely. The KeyLab MkII has such a setting/knob but it's too large for my purpose. And no device in the MiniLab 3's competition (with a true MIDI out) has such a capability at least I haven't found it.