We actually tried it back in Alpha Testing. It failed. As long as the person with the "biggest guns". It fails. PvP sucks literally and totally in Earth and Beyond. All you need to do is have the big guns camp and the other team can get screwed.
We kept Sword for a purpose to show players PvP cannot be done in E&B. And, if you look at the equipment, the beams, missles, projectiles, reactors and shields. 150's had all the same gear no matter class. There is no variety that was the biggest downfall of Earth and Beyond.