Very intresting answers, and yes, i would say it could help with traumas. although facing something like that is gonna be almost impossible to get over it completely, cause u will need to face the demons of that period constantly over and over again.

It might help with some people but i would say it's quite dangerous cause everybody is different and in some situations this is gonna make it worse cause you gonna keep yourself locked each lucid dream in that stage of your life. (this is for the big ones though)

But smaller ones i think 80-90% (random number ) of the people could handle that easy, aslong as it's not little children.

But the biggest challenge is ofcourse to create so many lucid dreams, atleast a couple each week to get a good effect. if the time period is to long between lucid dreams it's gonna reduce the effect, so i would say these kinda things for many people only gonna work when they have some magical pill or something like that to let them enter a lucid dream that last atleast a couple minutes.