Swoop Cannon Skills 5110 And 5111

Every server, (java especially) has shit implementation for these skills. They keep coding them like Siege Golem skills - can only attack doors and is single target.

Swoop Cannon skills are meant to attack in area where cannon ball land. 

Problem is, when used in dev mode cannon ball always fly in the same direction with a straight path. It's meant to fly in a parabolic trajectory, and detect when collide with geodata.

I am wondering if anyone is aware of a client packet or something that maybe calculate the flight path on client and then sends collision data back to server.

It doesn't seem like it would make sense to make these calculations server side, and even if you did, you'd still have to send client packet for path trajectory. 

Anyone know how to change it?