MIDI/user mode

I’d like to be able to send my controller’s MIDI CC commands on into Ableton via the remote script (rather than have to omit those controls out of the controller script altogether).
Either (or both!) of the following options would be great:
a) configure an individual control to send MIDI CC data into Ableton, in addition to its script-defined functional mapping;
b) a “shift” mode (a bit like the Push 2 “user” mode) in which all other controls just send MIDI CC data through into Ableton.