--- Option to change "berthing quality". I know life support is largely abstracted, but the option to allow us to have crew quarters take up less space for any given deployment time in exchange for diminished performance would be flavourful. Likewise, allowing them to take up more space for a bonus to performance, as the opposite tact. Gives some nice RP to different ships. Maybe corvettes are cramped ass vessels because they really aren't meant for long term habitation while cruisers very much are.
--- A nice dovetail would be to allow that malus to tick down to zero when on shore leave, so ships that spend a lot of time in port by design (system defense ships, etc.) won't be as badly affected.
--- Obivously, fightercraft already have a greatly reduced crew need, so while this might be beneficial in some cases for them, they should still have to allocated a minimum of 1 Crew Quarters Fighter for both sanity's sake and to prevent potential null errors.