I always leave it in D.
I only use 3, 2 or 1 to decelerate.
Except when drag racing, I do my burnouts in 2.
Also to obtain maximum acceleration start out in D then after the 1-2 shift, drop it back down to 2, so it will wind up to the 6200 rev limiter at 103 mph.(stock ratios assumed).
For the 2000+ cars leaving it in D is the best because it will shift at 6000 rpm in 1st. If you select another gear like 3, 2 or 1, it will shift at 5500 rpm. This is probably only specific to the INTENSE PCM reburn.