Yes, the output from Rectifier is perfect 
I remembered about a tool from you that left much empty space for not more needed lines. That was the intend of my question.
You are also right that DATHeader could be useful for to split warped quads before, but I do not think that those triangles will ever be planar enough that they are combined with other triangles.
One last question:
Should DATHeader ask for doing that optimisation or only run if all is set in the Options dialog?
I would prefer an extra decision should be done by the user!
I remembered about a tool from you that left much empty space for not more needed lines. That was the intend of my question.
You are also right that DATHeader could be useful for to split warped quads before, but I do not think that those triangles will ever be planar enough that they are combined with other triangles.
One last question:
Should DATHeader ask for doing that optimisation or only run if all is set in the Options dialog?
I would prefer an extra decision should be done by the user!