Im having some problems that mobs and players get outa los of my box crew, is this a weakpoint of multiboxing or is it some neat trick to make them face the target?
When you say "out of los" (line-of-sight), do you mean they hide behind things, or they go behind you?

If the former, it's a weakness of all ranged attackers, not just boxers.

If the latter, and assuming you're playing WoW, it's a weakness of boxing and there's no way to auto-face anything in that game.

I just have my whole team take a few steps backwards when that happens - that's guaranteed to have them all facing towards the target again, but takes up space and is really only effective for caster groups.

In PvP, I use nets and rocket boots to make space, since I don't play Tauren and therefore don't have warstomp.

Anything to hold them in place while I reposition, basically.