good question ... I'll have to ponder the answer.
If it is to keep cows in your shack for a video while still moving you can edit the script at line 333
this.speed=0.05;
change this value to zero.
you can also increase the speed to make them run fast .looks quite funny but may result in some "stupid" behaviour ....well it could be useful if you want your cows to spread out fast...once done you can reset speed to normal 0.05.
Each time restarting outerra
...or instead of each time restarting outerra
set debug_keys = true, in eng.cfg
then after you have changed the this.speed value press CTRL+ALT+SHIFT+R to reset all scripts