Ships need to be able to move in any direction they want in PvP, there are too many issues right now causing problems. Cruisers can easily spiral upward and broadside a target nonstop. It makes life very difficult for Escort class ships with very narrow 45' firing arcs. Also Klingons in general will use their cloaking to setup well above Federation ships and angle themselves to open fire. There isn't enough time for a proper response and to get in position.
I realize their explanation for this system was to keep it like the show, and it works fine for PvE mostly, but this will not work for PvP. I also read about limitations on the engine, but that shouldn't stop them from looking for a fix of some sort.