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Create two sysex buttons with default everything
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Create a knob that is a supercontrol of those two sysex buttons
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Set this to ON: Relationships -> Options as Super -> Buttons are send on only
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Create a momentary button that is a supercontrol of the knob
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Turn this to ON: Relationships -> Options as Super -> Not Steppers
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Now hide the knob and the two sysex buttons via: Advanced -> Hide in Performance
Now your button will send the value of one of the toggles on press, and one on release.

Download the Example Here:
http://mididesigner.com/qa/?qa=blob&qa_blobid=8899919778700226180