Item drops not resetting and score board sugguestion

[Villefrog99]

So i am using http://www.curse.com/bukkit-plugins/minecraft/ultimatesurvivalgames/838894
And i created the arena and it works fine, but whenever it resets to start for the next match players drops after they wete killed are still on the ground for players to pick up in the next round. Could you make it where it resets the arena it could delete all entities or player drops in the arena. Also for the scoreboard I have a plugin that like shows the players in color for ranks in tablist. But the two scoreboards are flickering which is very annoying i would like to be able to use both of these scoreboards so it would be great if there was a way to bind these two and let them both work.

Thanks,
Villefrog99