Another user mentioned that a button the S-Pen was detected as an action that could be used on the "Pedal Actions" screen. Can you check to see if pulling the stylus out also triggers a key command that would be registered as a pedal action? Just go into pedal actions, tap the text next to one of the "Keys" fields, tap Clear, then take the stylus out. If you see some text pop up, then that is useable to trigger an action. I believe I still need to add an "Annotate Song" option to the pedal actions (I forgot to do this in v1.0.5), but I will make sure it gets done in the next update (especially if this works for you).
Mike
Mike