"Another reason not to use the motor-interlock/emergency stop feature is the of the pilot's usage of an APM2.6/2.8 board.
These features are not compatible with these versions of APM, if anyone has managed to overcome this, I would accept that as a…"

"I think a solution in combination with both of your proposals would be perfect. 
Does anyone know of any cheap 1 channel radio receiver?
or actually, you could just use an existing channel on the quads receiver and monitor the PWM cycle and finally…"

"Has anyone figured out a workaround for the lack of emergency stop yet? "

"I realise this is an old thread but has anyone found a work around this issue of slow disarming?
Seeing as you cannot have an emergency stop whilst using the APM2.8/2.6 boards if there is ever an issue you have to wait 5 seconds to disarm the…"