2) If you were to take a unit/perk/upgrade from one other race what would it be?
If had to take one ability from one race to another... it would be to take the Planetary Fortress upgrade from Terran and give it to Zerg.
3) What would make taking this useful?
It would be really cool to have Zerg 'territory' to be that much more terrifying. I hate Marine's just dropping on over to snipe a hatchery/lair/hive, they should have their suits soiled whilst facing PF style blasts from the centre of the Zerg base.
If I had to pick a second: I'd take the Warp Prism from the WhitaRa race, as it is totally OP.
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