Sketch - Single border feature

I redesigned Sketch "Borders" panel to meet a big need for designers: manage a single border of a shape.

I wrote an article about this project, you can read it here:
https://medium.com/@UXchange/i-designed-the-single-border-feature-for-sketch-6ca896068dd2

I attached a GIF that shows a longer flow and how I handled corners.

Sketch improves version after version but they never added this feature.

Feel free to tell me what do you think of my redesign and which feature you would like to see next of Sketch.