FWIW I have two ways of organising my runtime that work for me

First of all I have renamed almost all the folders in my runtime.
I now have folders for each character broken down so that !!V4 collects all V4 items, with subfolders for !Characters and !Clothing
I also have folders for !Scenes, !Weapons, !Hair, etc

After that, I browse using the free version of P3DO all the time, only going into the folders in P7 when I want to use the item in a scene

Hope this helps