If i want to hold higher revs, i put it in N, hold the brake and give it a quick jab on the accel, doing this u'll feel the brake sink deeper (brake harder). Torque braking i think its called. Put back in D and I usually rev it to 3K or less, and for no more than a few seconds, partly cause i get a fair bit of wheel spin and also dont want to cut short the life of my tranny. On green let the brake go and accel away!