I am working with rulesets a lot and I am using this extension from the very beginning. This extension is ABSOLUTELY MUST HAVE for any modder, even if you are making a tiny weapon mod! It saves so much time debugging. With that csv editing, balancing things became a much more pleasurable experience. Not to mention y-script highlighting, it's just great!
I saw this extension evolving, features being implemented, and I am very happy for you @pedroterzero!