If I click on the 'Add Pedal Press' or 'Release Pedal Release' buttons in the notation editor and the device is synth plugin I get this message box:
"There is no sustain controller defined for this device.
Please ensure the device is configured correctly in the Manage MIDI Devices dialog in the main window."
The sustain controller actually is inserted and works (tested with a few piano soundfonts and fluidsynth plugin). Also the symbols on the scores are kinda hard to move around.
If the device is e.g. General Midi device there is absolutely no problem.
Also inserting and handling C 64 in the matrix works ok.