Hey @Jstirrat,
I can provide a bit more clarity on the E-stop, but not sure I can help with your actual question.
The LongBoard receives power to its ‘brain’ using the USB connection cable. When you hit the E-stop, the power to your motors is cut, but if you flip over the board, you will see a small blue light on the board is still powered. This is the USB cable still providing power to your ‘brain’.
To improve reliability, the new SuperLongBoard’s ‘brain’ now receives its power from the power brick. This means the ON/OFF switch controls the power, which means E-stops on both boards still works to immediately stop the motors in the case of an emergency.
You may be able to create a macro to assist, but I’m not sure it can be tied into an E-stop press.
Cheers,
Stephen