Thanks so much for focusing on this. I would love to see more customizable css features built in. I have modded the stylesheet and a few of the interface graphics to work well on retina displays and such - if you (the developer) are interested please reply to this post and I can show you what I've done. I would be happy to work with you on the continuing development of this plug-in. As a high-end WordPress site developer it's critical that my designs work just as well on mobile as on desktop.