All Nikon VR lenses that I am familiar with have automatic panning detection...I have not had a problem with leaving VR on, and in fact, I think VR is the best thing to happen to panning since autofocus!!!
The "secret" is not to pan too fast, or too slowly, and to track the moving target at the same,exact speed, and to continue swinging at that speed when the mirror is up,and the viewfinder is black...and THAT is very difficult for many people, unless they have a lot of practice under their belt.
There is no magic speed: how a pannign photograph turns out depends on distance to subject, angle of travel of subject in relation to camera, and size of object in frame as per distance/focal length combination. Panning can be done at high speeds, medium speeds, and slow speeds...loooong, slow pans at say, 1/3 to 1/6 second have a lovely look to them on some subjects. Kind of an impressionistic, "feeling-type" effevt is very common on slow-speed panning. Slow of course, is relative: on bicyclists at 30 feet with a 50mm, slow is 1/4 to 1/8 second; on hydroplane boats moving at 140 MPH, "slow" can be 1/125 second with a 300mm lens from 80 meters...
Some people like slow, blurry, motion-filled, "squiggly" panning shots, at times....others wanna' see the tires blurred, but the sponsor's decals really sharp....it depends. Subject matter and artistic intent and end use of the photos are big issues in panning; panning is a way to convey or express motion, movement, speed, action, etc. There is NO SECRET SET OF SETTINGS!!!!
I used to shoot a LOT of panning shots way back in the 1980's. One secret I have used for a long time is not to look through the camera, but to look right over the top of the pentaprism, and shoot with with both eyes open, and not even looking through the camera. This is ONE area where a camera with a full-time optical viewfinder can really help the novice shooter....with a d-slr, when that mirror goes up, MOST people's natural inclination is to slow down the pan...which is not that big of an issue as long as the mirror comes back down "soon", and the panning time is not "long" or "slow". DIGITAL CAPTURE has made taking panning shots easier than ever before!!! A person can shoot, review, and evaluate the speed/distance/lens length in SECONDS, rather than waiting days for slides to come back!