That sqs with solenoid option could work with a micro switch on the throttle pedal so it activates at a certain throttle position, like WOT engages the solenoid and you get the preset power split, then part throttle the solenoid is off and you have fwd until you WOT again.
Their website is in chinglish so I won't really trust what they deem is safe
Their website is in chinglish so I won't really trust what they deem is safe