I take no credit for creating this method. It has existed on GN2 for over a decade. (Although Gibson and SD still don't have a clue.) A problem exists when a DPDT switch is used to put two pickups in series using the method employed Jimmy Page wiring. There will necessarily be a 'dead spot' in one position of the selector switch. Either the Neck and Both positions of the 3-way will work properly but the Bridge position will be open-circuit OR the Bridge and Both positions of the 3-way will work properly but the Neck position will be open circuit.
There are enough poles available but some folks don't recognize how to make the best use of those two poles.
Here's the strategy, plain and simple. It makes the position of the pickup selector irrelevant.
For any 3-way pickup selector used in a parallel configuration LP, Telecaster, whatever.