Scrap reward based on event population

Hey imthenewguy, my server really enjoys this plugin and the recent new map pack release. I wanted to ask about possibly making the reward be X [item] per player who joins the survival arena. 

for simple terms lets say 20 scrap per player? 2 players, the reward would be 40 scrap etc, 4 players, 80 scrap, and so forth-

would this be a feasible optional feature?