Version 1.5.4 is published here and on github. It adds a new toggle which will allow you to enable the category icons again.
Since the theme is so new I didn't know people would be attached to certain elements of the design.
If you have usability suggestions please post them.
We have one other major feature we are working on in which we want to integrate a grading panel which will show teachers items that need grading. Much like the teacher and student dashboards, this will slide down and present items much like some of the "Marking Blocks" do. With integration in the theme you can free up space for learning content and avoid adding a block that eat's up space. Our teachers have been asking for a way to quickly see what things need grading.