Sometimes when I'm playing I'll be looking at the building construction menu and just get completely lost as there's no real distinction between the buildings. I think the tabs are nice, but I want to be able to glance at all the buildings at once easily and not go hunting for the grey building amongst grey buildings. Before: After: Green: Econ Blue: Factories Yellow: Defense Red: Strategic
A mod would allow tons of flexibility. You could use your configuration, or you could make metal blue, energy yellow, factories grey, t2 factories red, etc. Anything is possible with mods. Watch a mod come out that dictates this. When you see it, there should be a little tear in your eye, because you were the founder. Have a great day man!