How to get my custom categories to appear in the sidebar?

Hi Dave...Tags seem to accomplish what I want. I have way more categories than the built in ones. They just don't have the little custom icon. IMO, this is something that will enhance the user experience greatly. Categories such as Entertainment, Insurance, Auto, Home Mac Software, TV & Music Streaming, Photo/Video, Cloud Storage accounts, etc. I could go on and on, but suffice to say, it would be great if the system allowed creating your own categories and adding your own icon. For now, tho, it seems that the Tags do the same thing, minus the customization of look. Along with this feature should be the ability to drag any item onto the category shown in the sidebar, for it to be immediately added to that category list. Hope you can help to make engineering work on this. Thanks