very few s3s and no s3+s had the ability to change the voltage electronically.
its highly doubtful that setting will do anything on your s3.. you can try tho. you need a way to measure it to see if it did work.
My S3+ with Kano's updated software:

At these settings my S3+ hums along at 500GH/s. Are you saying the voltage field is meaningless and has no effect on the miner? I'm not sure I agree.