What can i add to my server batch file to stop HotAirBalloons and ModularCars from spawning , i use the HotAirBalloon.population 0 ( and the same for Modularcar)  and even though i get the response that the population is "0" they are still all over the map, 
I am hoping that i can add the command to the server startup batch file (in my customcommandline), and welcome any info

I'd suggest trying the server.cfg or a plugin such as Auto Commands.

Wulf

I'd suggest trying the server.cfg or a plugin such as Auto Commands.

Thanks Wulf I will give it a try,
*edit
problem solved Thanks again