I'm having a difficult time doing the simplest of things with LayoutEngine blocks. I don't want to have to code CSS for every little detail, especially when you want to change the style depending on the what's going on in the page.
The perfect example is a Sales Page. Sales Page commonly have numerous styles throughout the page. Sometimes one image will have a box shadow, while others don't. Or one paragraph heading is green, while another is red.
It would be nice to have some simple little selectors built-in to allow our clients to easily change things themselves. I've had 3 different clients request the ability to change colors of text. They want to easily select colors and things and they simply can't do it. I have to use inline styles in the HTML, which is terrible.
shortcodes, custom blocks, something... please :)