A massive quality of life improvement to the livery editor would be the ability to edit custom names to each vinyl shape/group/decal instead of the default numbers given to them, similar to how photoshop/
This would make it way easier to manage large big design projects with tons of vinyls scattered all over the place with no clear indicator of which one goes where.
This is also how photoshop/paintshop applications treat its layers.
Here is a quick mockup of what it could look like compared to how it is today.
With custom vinyl names
With numbers the way it is today.