That is an excellent idea and has been discussed elsewhere also; I believe that I was one of the first to raise it and have mentioned it on a number of threads - not least on my “Roon 1.3: Top Priorities” thread, where it is my third request:
I have also mentioned it here:
And here:
My list of categories is similar to yours, except I had not separated out live albums from studio albums, and I had an extra category for “DJ mix”.