noooooooooot true...
the reason that nitrous uses a throttle based trigger is b/c if you are at anything other than wot, you will burn it up. you can run a dry set up w/o burning the pistons. it doesnt occur automatically.
however, a good kit that is dry is either zex (
www.zex.com) or venom (
www.venom-performance.com) and they both monitor your a/f ratio, keeping you safe. the websites explain.
if you go w/ a wet kit you do get the fuel solenoid and jets, which do what you said.
basically you need a trigger that kicks on at wot. a bottle opener does nothing if there is no nitrous solenoid....