It's not easy to add per-player database settings like that, we can't just click a button and make a new setting. Having it available to disable in environmental sounds is a good compromise.
Step 1: Edit 2 classes in EnlightenDatabase to have the new setting
Step 2: Add it to the defaults for createPlayer
Step 3: Update all current players in the database to have the default value
Step 4: Make commands to toggle it, or a settings GUI
For tiny tiny settings like skill sounds, that's not worth it.