I didn't even see the outline theme, I was so focused on Clear Crystal, haha. That's totally on me. But I do think it would be handy for some of the others that don't have that option so people can adjust it for personal eye comfort.
Also I have to say I'm so impressed at how quickly you respond to comments, and how you take suggestions into consideration. It's something you don't see very often, and it's incredibly refreshing!
Keep up the good work!