PWM auxillary output on Motor 5 or 6

It would be great to be able to control with auxillary channels 5 to 8 (unused on X4) any standard servos or esc connected to naze32 motor 5 or 6 outputs. I have particularly in mind using the forward pitch added to ch8 to control a LED pannel power with a small brushed esc to simulate a booster effect.