Run AI Script At Location
Use the script "Set Unit Order To: Junk Yard Dog (Roam around)"
Or, you could manually initiate "crazy/wandering" units by creating a few(2-4) locations(around the area of units you would like to wander) and set triggers for units within the area where you would like the units to "go crazy/wander" to quickly order move to these locations. (hyper trigger required..). (May lag a little.)
(geez, I wanted to say that AI Script... oh well.)
btw... How come Kroama has -20 participation?
-always
conditions
-run al script
set unit to junk yard dog
-preserve trigger
Isn't wandering different then units going crazy?

wandering (adj)- Without a fixed or regular course. See 'erratic'.
Sounds 'crazy' to me.
Crazy means like the Lurkers burrowing and unburrowing fast or interceptors going everywhere. That's probably what most people coinsider crazy and wonder is just the Junk yard dog.
You guys get too technical...