It's not up to Freezzer Gaming. We need a map maker to do that; editing item spawns, adding item spawns, editing vehicle spawns etc
Also we can't do anything about the suggestion you made about the gas, that was what I meant by changing Unturned altogether.indeed the 'Gas' idea is maybe out of the limit what the Arena feature provide but the other things can help
Indeed the 'gas' idea is out of the limit what the Arena feature can do, it was just a option if it was possible.. but the other things what i said is possible and then you already have a sort of better Battle Royale in Unturned