D) Liners become faction property like other ships and are treated like transports for ID purposes. They are given a buff (Mjolnir permitting) and are hooked (Cannon permitting) to only permit a certain degree of non human cargo.
... but let's focus on getting a bunch more liners in the mod. I don't see why we have a luxury liner, a prison liner, a slave liner... but no "middle class" liner. Something generic would be nice.