[konidias]

Do you comprehend how hard it would be to even doubleclick a player with 3.5 speed + lag? Try right clicking a person that is running around during a battle. It's nearly impossible. :|

You have to right click all over the screen, and if that is the case, you'd be casting spells everywhere but where the target currently is.

A simple "left click to lock on a target" system would be easier. You just click the player and it highlights them somehow, and you use the spell and it shoots towards them, even if they move around (if possible). Then you have a good system. Otherwise it's still going to be frustrating.