All of this switch talk is making me think about my Super J's switch. I love the neck-solo (P'ish) and neck-bridge parallel (J-ish) settings. The bridge-solo (Jaco'ish) setting is something I'll never use as it's just not my taste. The middle-bridge series (Stingray'ish) setting is the interesting one. I like the sound and it's very convincingly MM sounding, but I find the mids a little overbearing and there's noticeable volume jump when in that setting compared to others on the bass. I would love if that setting were in parallel similar to a Sterling as compared to series like a Stingray. I'm guessing that modification to the existing 4-position switch would not be possible, but if it is possible, has anyone done that particular mod?
For under $100 you can have a switch made to your liking.
I will say the MM series is a beast setting great for Heavy music. The MM series setting is a really sweet laid back MM style. I love this setting on my Fretless