Jeff,
Which stereo verb do you use?
tj
n-Track! 
I start with “Ambience 2” setting and tweak. I find the important part is different values for “early reflections” between left and right. Setting “room size” differently can also be nice. Both of these can be fine tuned for partly panned tracks (faster early reflections and smaller room size on side track is panned towards). Finally, increasing damping so it’s more of an image effect and less of a reverby effect. However, it’s still always reverby – n-Track early reflections aren’t realistic enough to damp out the tails too much. I happen to like a fair amount of reverb on acoustic guitar (when there’s only one or maybe two). For a very dry stereo image, it wouldn’t work.
Of course, you have to remember to check “expand mono track to stereo” in the track’s properties to get any effect to yield a stereo result. (This only applies to plugins on mono tracks, and doesn’t apply to aux and group plugins.) I know you know that teej, but put it in for the benefit of others because it’s easily missed leading to false impressions from testing.
I’m sure that convolution-based reverbs like SIR would work even better (with the right impulse files). It’s on my list of things to investigate. Does your list ever get very short? 