There is a lot of precedent for this. Even on Earth, in 2026, international maritime law states that there is no such thing as a vessel with "democracy" and that a captain always has supreme command. Ships, airplanes, etc are all in a category that operate as strict autocracies.

Sure.

How long's the longest voyage these days?

Mutinies aren't so common nowadays, but they were when ocean voyages were measured in months and years.