I don't quite remember whether using nikita in the air caused me to move, but I did want to add a few things. This obviously can't be used too liberally, because nikita takes a while to actually fire, and you're very vulnerable while firing. The best case scenario for this would probably be against someone who has just as bad an aerial game as Snake, or someone who waits on the ground a lot. Also, you could do it when you're really high in the air, so it's not as clear to the opponent exactly what you're doing. If it's a dark background, it can be hard to see the nikita. So when your opponent comes to attack you, they'll be treated to a nice little surprise :]. However, I don't know whether the nikita automatically explodes after being canceled when it's still in the air. I'll have to test this later...
Also, I think it's important to use it while you're still hanging onto cypher, so the upward momentum helps you stay in the air long enough to shoot + cancel. If you do so otherwise, the nikita tends fall a bit behind you. I only remember being able to effectively do this once, but it was really helpful the one time it actually worked.