Hey, and yeah, basically what the headline says. I'm not sure if it's a big thing or not to implement, but the option would be really awesome. Availability to customize the colors in the editor, or choose between a lighter or darker version. I've my specialisation in school, where I'm using Visionaire whole days, and my eyes gets quite tired of the white background. Game Maker did this when they released Game Maker Studio, and it was a bless for the eyes.
Just a suggestion though.