That could bring up problems, i.e. the unit shows up as an idle worker when not busy. What exactly is this for, so we have a better idea of how to help you.
I think it does.... tried changing what vis the lowest value that can be put there? or used shift + enter while changing value?.... ive done this in one of my maps, but i dont remember how....
Just a thought, could you make a trigger that would make any unit given the 'stop' command to revert to the 'hold' command? Thus making them not auto-acquire unless within range?