1) Correct!
2) Vent Hell to the Arcade would be 3d6: 1 by default, plus 1 each for Dock 21 and the Arcade itself.
3) Yes, shortcuts could make the highest Distractions mechanically impossible eventually.
4) There's no roll/Move needed for a Delivery job unless the Distraction feels like it would necessitate one - otherwise, all you have to do is spend the time segment fulfilling the job.
Thanks for playing HARDCASE! If you're hungry for more, there's a collection of expansions by myself and others here.