I also have a ThermoWorks Smoke for my PBC, have used it a few times and seems to work great!!
When I ordered I got myself some extra probes, if I need to have two separate probes in meat I can.
Once you get the PBC up to temp its not like you are making adjustments to maintain the heat, so do you need to use a probe in the pit all the time??
Or I can just run all the wires and plug in what I want in the unit to get the temps I want at that time.
That's the theory at least, so far have just used with one probe in the meat and one in the pit.