I have used the freeway switch in a couple of my PRSs, and currently have a P245SH with one. There's a few different versions of the freeway switch, the one in the video is pretty much a direct replacement for the rotary switch, with the outer/inner parallel, and inner series option. For that switch you cannot use resistors, and you wouldn't because in no position would you get a split humbucker on its own. With other freeway switches, you can do split humbuckers, and you can use resistors like in the DGT and a lot of other PRSs. The wiring in a freeway switch is split in the middle, where you have the hot side on the right, and the ground side on the left. You would have to work out in the wire diagram on the ground side where the switch is grounding one of the coils, and instead of directly connecting the wire to the switch, you solder the resistor to the switch and the wire to the other end of the resistor.
Unless you're very familiar with wiring diagrams, I'd get the freeway switch in the video, which is much, much easier to use than the rotary, and you don't need to worry about further wiring changes. If you want to get a more flexible setup, I would use pickups with 4 conductor wirings instead of the PRS 3 conductor wirings. In my P245SH I have a freeway switch and Bareknuckle Abraxas pickups. On one side, it's the standard 3 humbucker sounds and on the other I have it so it's the bridge pickup in parallel, two coils from different pickups in parallel and the split neck pickup. I also have a push/pull switch on the tone and the push/pull will switch from using the split neck to use parallel neck (making all positions noise cancelling). Works great, but it took quite a while of experimenting with different setups to workout that's how I want it.