How do I convert a stereo source -> Panned mono tracks.

I don't know how Revalver handles this but I usually use a mono track, make my settings and then clone it, adding a little delay with the channel tools plug to one of them, and then panning each individually. Assuming you're going for the classic "big stereo guitars" idea.

I'm talking about making your settings on the track and then cloning the track, whether or not it's a recording or a live track doesn't really make a difference.

Yes you can record a stereo input into different tracks in SONAR. You may need a splitter for your cable or 2 microhones, and an interface that can handle 2 or more inputs, which I belive the Fireface can do.
And you can record a mono source onto multiple tracks, too.

If something like this can generate stereo outputs and hence record to stereo tracks I would go that way for sure. Recording everything to mono and cloning that track and delaying it is not necessarily the way to. (typical guitarist approach to synthesisers too. Remove all the wonderful internal stereo width by creating a mono track and cloning it for delay purposes. NOOOO.) If anything generates stereo then I say listen to it and see how it sounds. Record it!
 
There are plenty of things inside Revalver that will set up a stereo image. Dual delays, reverb, chorus etc.. If these effects are not worth recording then go for mono for sure and process later but on the other hand try creating the stereo width yourself within Revalver and record it that way too. Sometimes it is better to use the internal effects processing, that is why it is there. The internal effects will also sound a little different to your DAW effects and will go a bit towards separating the guitar sound in a mix a little better too.
 
Some plugins such as Headcase by ACMR BarGig has dual amps and cabinets and mic setups and you can create some pretty wild and wide stereo imaging in a way not so easily done outside the plug in. Silly to waste it by slamming it to mono and then trying to create some pseudo image using delays.
 
Channel tools is all you need for panning L and R channels independently.
 
 

Jeff Evans
If something like this can generate stereo outputs and hence record to stereo tracks I would go that way for sure. Recording everything to mono and cloning that track and delaying it is not necessarily the way to. (typical guitarist approach to synthesisers too. Remove all the wonderful internal stereo width by creating a mono track and cloning it for delay purposes. NOOOO.) If anything generates stereo then I say listen to it and see how it sounds. Record it!
 
There are plenty of things inside Revalver that will set up a stereo image. Dual delays, reverb, chorus etc.. If these effects are not worth recording then go for mono for sure and process later but on the other hand try creating the stereo width yourself within Revalver and record it that way too. Sometimes it is better to use the internal effects processing, that is why it is there. The internal effects will also sound a little different to your DAW effects and will go a bit towards separating the guitar sound in a mix a little better too.
 
Some plugins such as Headcase by ACMR BarGig has dual amps and cabinets and mic setups and you can create some pretty wild and wide stereo imaging in a way not so easily done outside the plug in. Silly to waste it by slamming it to mono and then trying to create some pseudo image using delays.
 
Channel tools is all you need for panning L and R channels independently.
  

I will look into those settings in Revalver, but these are temporary tracks that will be reamped with one or two mics.  Whatever process I come up with should also work with miced mono tracks.   I suppose I could run the miked tracks through Revalver without the amp sim, but that would be a resource hog.  If I'm just using it for stereo split and delay, maybe I could put one instance in an aux bus.
 

Sanderxpander
If it's just a temporary track, why go through all the bother to begin with?

Because I still need to do the same thing to the miked tracks.  
My question applies to both.