A typical three way switch (toggle or blade) doesn't have enough poles to give you both humbuckers split in middle position. In toggle format, a 4PDT on-on-on could do it. Thats how its done on the John Petrucci guitar. See attached pic of diagram
In blade format, you'd need a superswitch (4 pole switch - "normals" having only 2 poles). Although maybe one of the Schaller Megaswitch types that aren't outright 4 way switch can do this as well.
The Master Series/Parallel switch can be done with any two way, 2 pole switch (2DPT), which includes push-pull switches.