No, I am using it for surround:
http://www.audiocircle.com/index.php?action=systems;system=416
However, I did think of a use for it in a stereo configuration (in combo with the switchbox): Three stereo sources with independent balance settings for each. Perhaps a little excessive, but it's possible that your CD player. phono preamp, cassette deck, computer soundcard or whatever else isn't putting out exactly equal levels on each channel and this would allow you to have a 'preset' for each. Actually I did find this to be the case with running my soundcard into the SCPA. The left channel was about 2 or 3db lower than the right one when I had calibrated the 5.1 channels using the Denon's pink noise as the source. It's also probable that a TT doesn't have perfectly matched levels as a CD player might.
In essence calibrating this thing with perfection and convenience would require one of the following:
1. SCPA within arm's reach while you are sitting in the sweet spot
2. SCPA at front of the room and using binoculars so you can see the SPL meter needle from 12 feet away.
3. Having a friend in the sweet spot give hand signals to you while you adjust the SCPA.
4. Use something besides a radio shack meter which allows you to see the levels while you are at the controls. Like a laptop or something.
Eventually I will want to opt for #1 as I would like to move the electronics near the chair\couch. So it is somewhat of a logistical challenge not having a remote control for this preamp, but it's clear why there isn't one and why it's probably not practical.
I also thought that using a single sine wave instead of pink noise might be a way to faciliate doing it the sneakernet way, and running back and forth to check the levels since pink noise is more random and makes the needle wiggle more.