Are you talking Nos the name brand or are you talking nitrous oxide? eighty8customs (VIP Style box) has a nitrous kit on his not sure the brand name and I believe he has an auto. I have never used nitrous with an auto tranny (never owned an auto) so I couldn't tell you anything about shift points I don't see how it would throw them off though.
Do some more reading before you put nitrous on your car. I would only run a 50 shot or 75 pushing it on a stock engine.
Nitrous Oxide Systems - DIY NOS KIT FOR CARS! NOS & Nitrous Tips - Tech Review - Turbo Magazine
I have some better links on my home computer I will send you.