Well, I suppose the answer depends on your ability to decipher Chinese translated into less-than-artful English. From the NAZA-M V2 manual:
Notes of Intelligent Mode
(1) In ATTI. / GPS ATTI. Mode, it has landing judgment, which will stop motors.
(2) Start motors in ATTI. / GPS ATTI. Mode, you have to execute CSC and then push throttle stick
over 10% in 3 seconds, otherwise motors will stop after 3 seconds.
(3) During normal flight, only pull throttle stick under 10% will not stop motors in any control mode.
(4) For safety reason, when the slope angle of multi-rotor is over 70° during the flight in ATTI. /
GPS ATTI. Mode (may be caused by collision, motor and ESC error or propeller broken down),
and throttle stick is under 10%, motors will stop automatically.
Notes of Intelligent Mode & Immediately Mode
(1) If you choose the Immediately Mode, you should not pull throttle stick under 10% during flight,
because it will stop motors. If you do it accidentally, you should push the throttle stick over 10% in
5s to re-start motors.
(2) DO NOT execute the CSC during normal flight without any reason, or it will stop motors at once.
(1) If you choose the Intelligent mode, and the throttle stick is under 10%, this will trigger the landing
Procedure, in any control mode. In this judgment, pitch, roll and yaw controls are denied except
the throttle, but multi-rotor will still auto level.
(2) In any control mode, DO NOT pull throttle stick under 10% during normal flight without any
reason.
(1) Any of these two cut off types will only work properly if TX calibration is correct done.
(2) In failed-safe, CSC is denied by the main controller, motors will hold their state.
Basically, my thought is, never move it below 10%.