The PvP arena is sort of... chaotic right now since projectiles go through walls. Its sort of ridiculous and you have to spam to get any kills. Also, this can happen:
Yes, I'm standing outside the enterance to the PVP arena and getting kills. Because I can fire lazers through walls.
Another idea for the pvp arena, how about a leaderboard only for the pvp arena kills? Most kills in the pvp arena by the end of the month could win something or win bragging rights.