Thanks for your suggestions..
About fireworks, if a server wants that mod, he can add it. But I think I can add a boolean (true,false) in fireworks mod.
I don't know if is good idea for moving around.. Is just a Preview of zone center.(Yesterday I tried with moving (like olympiad observer), but seems bad.. No point).
About "difficulty level in drop", if anyone buy it, he can change it. It's just a text.