Ok Carlos. As soon as I have some free time I'll try to assemble this type of script.
> I believe the #1 with an offset number (x and y) set by the user,
> could mimic bend allowence for sheet metal. Just the unfold had to be manual,
> if the script placed a curve on center of the offset, and this curve is used to set the rotation. MOI's snaping tools are great for this.
Could you be more specific and upload some images, or (better) a video, showing what exactly you mean ?
There is one ultimate guide about press brake, it mentioned everything about press brake as well as the bending operation, hope it can be helpful for you. Here is it: https://machinemfg.com/press-brake-ultimate-guide/
Here an example of my sheet metal workflow for parametrics parts
The workfloor is :
1 - Simple 2D part's drawing . ( complex part's can be import from SOLVESPACE )
2 - Part's extrusion
3 - Part's 3D connection/assembly with junctions .
4 - Final boolean union
5 - Layout with Make2D4Views function
6 - 3D part's export in STEP , SKP ...
7 - Layout export in PDF