Heck yeah it counts! I wish there was a decent track near me.
IMO the N80 is too slow for sports. AF is not quick enough for fast changes in direction or distance and 2.5 fps is slower than my finger. My FA with the MD-15 is faster because I don't have to wait until it is in perfect focus to shoot. I do enjoy using the N80, though.
I have the RB/CXXX L grip but it's on a C2 right now so I still have to cock and trip the shutter with my right hand. Regarding the masks, I measured the VF and angle of view of the 180mm then drew them up on the computer. Then I found that Graham Patterson already had a post script file on his website. My measurements with a steel ruler and AOV calculations were only .5mm off on the mask aperture!
I'll have to give track a try this coming spring. Since I work in a high school, I have easy access to events and coaches.