Set a shot mode in creative mode?

I really liked the one shot mode in Fortnite, and when he was out, I found that a great pity. Now my question is, if you can set this mode in creative mode 1 to 1, I know that you can set a lower gravity, but you still can't aim in the air. Do you have to adjust or build something for that?

Question: How do you set it that you can aim in the air?

Unfortunately, you can't stop that one is aiming in the air.
But if you wear balloons then you can aim it out!

Is not my friend.