Since there was no description, I went and looked inside the code to see what was tweaked.

The results are as follows.
Space Platform Scaffold, Space Plateform Plating and Spaceship floor now gives 10 per craft.

Each and every module gives 3 per craft. (In effect, this makes it considerable less expensive to craft a higher tier module, as this effectively makes it a 1 to 1, rather than 3 to 1.

1.0.1 added the following.

Heat Shielding gives 2 per craft.
Low Density Structure gives 2 per craft on normal tech cost only.
Low Density Structure using beryllium gives 2 per craft.
Landfill gives 10 per craft.

On one note, the landfill tweak is for the pure stone recipe version. If one is doing Space Exploration + Krastorio 2, without this tweak, the sand + water version of the recipe is 2.5 times more efficient than the stone recipe. However, if this tweak is installed, then the pure stone recipe becomes much more efficient than the sand+water version of the recipe, by a factor of 4.

It might be idea as a result if this tweak checked for the presence of Krastorio 2, and if so, scale up the sand+water version of the recipe instead of the pure stone version of the recipe.