One thing I would really like to see added is the ability to delete custom content from CAS. Did you ever download something only to discover that: 1. It looks terrible on your Sim? 2. You can'...
I also find that loading up a Sim with my unwanted cc, and saving it to my library, then looking at the Sim with the Sims 4 tray importer is the easiest way for me to find CC.