Z_DUAL_ENDSTOPS is a feature to enable the use of 2 endstops for both Z steppers - Let's call them Z stepper and Z2 stepper. That way the machine is capable to align the bed during home, since both Z steppers are homed. There is also an implementation of M666 (software endstops adjustment) to this feature. After Z homing, this adjustment is applied to just one of the steppers in order to align the bed. One just need to home the Z axis and measure the distance difference between both Z axis and apply the math: Z adjust = Z - Z2. If the Z stepper axis is closer to the bed, the measure Z > Z2 (yes, it is.. think about it) and the Z adjust would be positive. Play a little bit with small adjustments (0.5mm) and check the behaviour. The M119 (endstops report) will start reporting the Z2 Endstop as well.
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