1. Correct, can't shoot because of Bailed Out.
2. Incorrect, can't shoot because no valid target.
3. Correct, during shooting, it builds and rolls an attack pool of zero dice. If Barkmann were on the tank, it would then also be able to shoot again after discarding every instance Damaged Optics.
Furthermore:
4. Because Damaged Optics doesn't reference hits or crits in its clause, using Smoke Rounds (and not rolling dice), will also clear the crits, allowing you full functionality without the drawback, as it replaces the dice roll with an effect.
5. Because Barkmann, Bobby Woll, and Clever Loader reference hits and crits in their ability clauses, they must attempt to roll at least zero attack dice to use their abilities. Smoke Rounds precludes this by replacing your attack roll with an ability. Barkmann's first attack must be conventional if you want a second, but his second may use Smoke. Insult upon injury.

Edited by user Friday, August 4, 2017 2:26:17 AM(UTC)  | Reason: Expanding upon the answer. Then spelling.