True, you won't make it to 4th gear, but that fact really doesn't have an effect on how the transmission shifts at WOT.

Auto trannys have a computer system which selects the best gear based on vehicle speed, engine torque output, and gear ratios for the gearbox. For the most part, it will always just shift at redline, as the vast majority of stock cars do. It MAY go into 4th early, but that depends on your car specifically.

If, for some reason, it doesn't shift at redline in 3rd... then putting it in D3 would be best. Otherwise, don't try to outsmart the transmission computer, it likely knows better. Just stick it in Drive and put both hands on the wheel, where they belong .

As far as launching.... Optimal brake-torquing is as follows:
1-Put the car in Neutral.
2-Rev to 3-4k RPM, and jam HARD on the brake at the same time. You'll find that the brake will grab "harder" when engine rpm's are high, since the fluid pressure is allowed to build up. The pedal should sink an extra inch or two... you'll notice it.
3-Now you're at the strongest braking power possible.
4-Put it in drive, without letting off the brake.
5-Rev the engine to the appropriate launching Rev's.
6- Release the brake and floor it at "GO".

Now... you want to find a balance between this and just flooring it. Brake-torquing allows you to get higher in the RPM range faster, but you may spin the tires. It is also not very good for the transmission or the braking system, but it'll survive.