Yes, I am very familar with the sPOD system, but the dual or single switch option is up to you. You will need to modify the sPOD system a bit, all of their switches are relayed and on-off, the switch is an easy fix, but additional wiring and deleting the relay will be necissary for the in-out winch control.
All of the setups I have done can still use the external remote, no reason not too really. You have a couple options there.
1. Hardwire the internal controls. This leaves the external plug open for use, just plug it in and your golden.
2. Canibalize a winch controller, and just use the plug on the end and the wiring into your cab, then have it wired into your sPOD system. This requires you to unplug one controller or the other, though leaving the internal controller plugged in is easy enough.