Unfortunately, the GDC has expressly said that a toggle function is not allowed in the Q&A:
Quote:
Please refer to Team Update #3. With the guidance of the referenced "does it do the same thing every time?" litmus test, using a Signaling Device button to toggle Robot actions would not fit within the intent of Hybrid Mode. Nor would using the Signaling Device to step through a multi-step routine.
The messages sent by the Signaling Device can initiate more complex actions or routines that are completely pre-programmed on the Robot. The Signaling Device can also be used to transmit field state information instead of a specific command or action.
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(emphasis mine)