I wonder if it is possible to use one of the front button to activate one of the pocket to get balls. I know it's possible to cut the wire of one pocket, and put a normally closed switch in serie with the sensor.

I think the front loan button is connected from ground (pin 8 or 9) to switch to pin 21 of the dongle. Maybe it's possible to use the two pin and activate a relay connected in serie to one of the pocket sensor.

I'm just not sure if there's any voltage passing throw the loan button and so on. Not sure of the wiring I must use for safety.

Let me know if you have done anything similar.