Can you cast it on a neutral critter and if so will the critter still be neutral to the enemy even if you control it?
It would provide a nice scout for ~10sec or so whatever the time is on the ability.

Also, if you target a worker will you be able to construct buildings?
If the ability is timed then i could see the SCV switching sides mid building, but Drones and Probes wouldn't have that problem.

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Q u o t e:
Can you cast it on a neutral critter and if so will the critter still be neutral to the enemy even if you control it?
It would provide a nice scout for ~10sec or so whatever the time is on the ability.

Also, if you target a worker will you be able to construct buildings?
If the ability is timed then i could see the SCV switching sides mid building, but Drones and Probes wouldn't have that problem.

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If you control a critter it switches to your side. So it would be targetable.

You can build buildings with parasited units. The SCV case is a bit of a challenge (though you could just parastie him again mid-build) but the Protoss and Zerg work easily enough.