This is a plugin requests thread so if you want the plugin made you can request it. Not to see if people want it. Although, I think it's extremely good plugin and I would love to have some fun with it.
I would absolutely love this. Especially if the firework emitted the 'burst' effect in a configurable color as it traveled through the air!
To make it better you could decrease the damage to the blocks it does, decrease a bit the blast and increase the speed of it. Other than, it's absolutely AWESOME... Maybe you can make your own minigame with that Good luck mate!