Can you explain what you mean by "visual color representation"? What is it that CraftWare does better than Cura in this regard? Do you need more contrast? I'm currently working on a (hopefully final) rework, so input is appreciated.
Yes, more background contrast would be nice. Current grey on white make it difficult to view, especially custom printer build platform stl files are difficult to view.
CraftWare has nice colors for gcode viewing, I'm attaching an image of what it looks like. Cura doesn't have to have same color representations, but something towards what CraftWare does would be great.