Actually this will give them a unfair advantage in several ze maps. I will post names when I remember them.
ze_potc_iv_fix, rigth after the light house blows zombies are teleported onto some boats to let the humans escape. And if they use /ztele they can come and get us, thereby exploiting the ztele command in my oppinion.
I have other examples to, and I will update as I remember the maps.