The setting is exposed as a check box in the QGroupBox instance that visualises the ControlGroup instance.
The setting is saved under "[control group name]/Enabled", but only when it is "false". The default value is "true".
This is done by:
1) Implementing said protocol in a new controller input class CemuHookUDPServer.
2) Adding functionality in the WiimoteEmu class for pushing that motion input to the emulated Wiimote and MotionPlus.
3) Suitably modifying the UI for configuring an Emulated Wii Remote.