You have to be in developer mode for that to work, and from what i can tell developer mode is triggered by something that our clients lack completely in code.
Adding to that, once you're in developer mode, you would still have to specify the location of the command you're inputting, unless it's variable/location based, but then you wouldn't be able to set it to spawn with the maps timer, and it wouldn't ever work right, so even if what you wanted to do were possible, it still wouldn't work.