Recall: Run Ai Script For Location: "Recall here"
- Make sure to place an arbiter somewhere in the map for this player.
- Trigger must be for computer player.
- Make sure recall is researched
- Make sure recall is set to 0 energy (if necessary)
Scarabs Roaming: Run Ai Script For Location "Junkyard Dog"
- Make reavers attack a unit.
- Constantly reset the units health so it doesn't blow up.
- Set Unit Hangar Count (for reavers) constantly to 10 so scarabs don't blow up.
- Lay a location on the reavers and move all scarabs to area you want them to 'roam'.
- After moving, Run Ai Script For Location "Junkyard Dog" at that location to make them start roaming.
- Set the players to enemy for the computer, so the scarabs will attack them when close.
Hope this helps.

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Setting Recall to 0, I'm pretty sure the computer will still stop Recalling. Try constantly setting energy to 100% for the Arbitors casting Recall.