Currently the editor background color is DARK GREY. Please provide buttons to quickly change this color to any predefined color or color from a color table. This would be important to see how the current image would look on backgrounds with different colors!
I'd also really love the ability to change the background of the editor. It seems like a basic functionality that comes with every other kind of image editor (PhotoShop, GIMP). I capture several images a day for my work and many of the images are the same color as the background, making it very difficult to detect &/or get a fine edge on them.