I think in this instance I used the top switched pot listed here.
http://www.axetec.co.uk/guitar_parts_uk_053.htm
You'll find that the majority of all switched pots use the mini-sized potentiometer.
Wiring to add in the neck pickup is very simple. On the 5-way switch, take another wire from the neck pickup connection tab to the centre tab on one side of the switch. From the top tab of that side of the switch (nearest the pot itself) take a wire back to the common output tab on the 5-way switch and when you pull the knob up, the neck pickup is always connected to whatever the pickup selection is.
You could always take the top switch output to the volume pot input tab, but as I already had the 5-way switch output wire and a leg from the treble bleed capacitor+resistor circuit going through the hole in the pot tab, it was easier to take it back to the 5-way switch. On my 5-way import style switch, the two central terminals has a pre-made link between them (which could be snipped through if you wanted to keep the two sides of the switch separate) so I had a completely free contact I could wire to.
As I wasn't going to use the other half of the pot switch, I ran the wires on switch across both sets of terminals to double up on the contacts for increased reliability.
Basic pickup and switch connections only show: