2. We're currently working on adding the ability to edit just one element or all that are associated with that class. Should be live in a few days!
3. Yes and yes. We're super interested in this idea as well. We've been testing out showing all the style elements in use on any given page ( i.e. on this page you're using these 5 grays, 4 type styles etc.). With that information, we can allow users to "add" those elements to their saved styles and see if something on the page doesn't match. For instance, the red we use is #C8080A but I can now see that in these 8 places we're using a red that doesn't match. Would love to hear your thoughts around this!
4. There is actually a "History" tab located on the side-panel where you can view the changes made to that page over time. Let me know if that's what you meant and how we could improve the visibility/usability of that!