This is the biggest missing feature in webflow. Add this and the code will be SO MUCH CLEANER. Being able to target all links, all UL's, all LI's, etc.
Also, adding the ability to target based on the parent and Webflow will be the de-facto standard for this type of service. For example, being able to style "#content ul li" without having to add a class to each li.
I really think you guys should make this your #1 priority. Everything else works so perfectly.