Was the video you watched from V-Town guitars ? If so, he got that idea from me.
The pickups are not series/parallel pickups, they are just wired to the switch as such. It is possible to change them from series to parallel very easily - I have done this and also returned it back (sounds better that way). Making them parallel improves treble response, but there is a big drop in bottom end.
I have also added a on/off switch for the neck pickup, allowing it to be solo'd in the former 'all on' position. Wiring diagram (series):
Pickup options produced: