Please NO!.
Please don't make it so crew is a commodity that has to be replaced - First rates should not be pushed out of the way just because 2nd rates bring less risk. - Don't ruin the game
Officers - We should have officers and they should give bonuses much like Modules.
Provisions - Personally i think provisions should be a commodity and necessity that all players have to pay close attention to... Run out of Provisions on a long journey and maybe you won't complete that journey. (Provisions production buildings could be a thing)
Crew - NO, NO.