This is my Suggestion.

I think this Assembly application is much going better if Assembly Creator team Add a "SVG" Editable Vector on each shape.
Sometimes i want too trying to create some of my own shape to my Design but i cant, because shape is limited to edit.
Hopefully i can able to edit a shape somededay.

Please. Thanks..

Daniel Siapno about Vector & SVG Maker - Assembly, v1.1.1