I have material tabs for default, my projects, clients and their projects, and I also keep some special tabs named for my favorite HDRI's, with favorite materials tweaked to suit. FYI: the last one is a real time-saver!
So I have a lot of library tabs, and about 1600 materials. Sure would be cool if the material tabs (only) arranged themselves in alphabetical order instead of random.
Bill G
You are absolutely right. This will happen in v2. We will announce the availability shortly. It is coming... ;)