Sorry and the rules the should follow when they're part of the faction.
From memory, the only faction rule applied to all factions, enforced at the game engine level, is expulsion for offenses against another member of a faction.
All other rules are entirely at the modders discretion, done via dialogue (example: trader that requires a higher rank for services) or scripts (example: magical ward on a door requiring specific faction rank), or a combination of both (example: dialogue can incorporate basic scripts or launch more detailed and intricate scripts).