Thanks for the answers.
About the jiggle I think it is a very specific demand and it was not about the placement of points but of curves or objects.
The great helmets have holes in front, but these holes are not made by a machines but by hands.
So what I wanted to do is to make an array of circles along curves to place the cutting objects, but I didn't want them to be at the exact same spacing.
I wanted to introduce some small differences in the spacing, not really noticeable but still present. That help to make it hand made.
But in most case I will use MOI to make "industrial" objects so that is a really specific case. I just don't have to build my medieval armours in MOI :D

About the scripts I'm not sure it will work in my case, but I found some interesting scripts along the way.