I'd love for the ability to choose between the light/dark version of the icons in the sprite.png file. As of now, most of the themes contain a light and a dark version. However, there is no easy way to choose between the too when I'm writing my code. The only way to change is to go into the CSS file and override it manually. 

This has been an issue already, because at least once now the classes have changed, causing me to go back and make further edits to my CSS file.

it should be something as simple as adding a light/dark class to element so that it knows to choose the appropriate background position for the sprite. 

This seems like something very easy to do that doesn't require much programming. I hope to see this soon!