Some suggestions about pvp maps

Hi, i have this problem that is killing me: ranged/casters classes (and melee too) that can shoot through the ground (especially in eots and warsong gulch graveyard). It's really annoying 'cause they can kill people through the ground very quickly, and that is sad :(
There is a way to fix that? Like a los system for various heights? But i think it's a client-side problem, so that must be hard to do :'(

As far as I understand it is part of pathing - which at this point is being implemented on Wrath of the Lich King realms at the moment. If Cata and MoP don't have them yet they might get it whenever Warmane will switch focus again, so all these players can do is just wait - finally Wrath of the Lich King times have returned ha-ha