What about janitor having all that access and security officers (mindshielded personnel) not? what about traitor chef hiding bodies in his freezer with "curious" janitor constantly checking that place?
While being pretty simple noob-friendly job, it provides more ways for people to communicate (people call janitor to clean up their place, and janitor can ask hop for more access (yes, there is hop who can give more access, lets make his job even more useless?)). Another problem is - department access is also equipment access, if there was a way to give only airlock access and not vendors and lockers access - it would be an option.
on a side note - janitor need to clean places - lets give him access to those places.
security need to catch criminals and are mindshielded(trustworthy) - all access.
science need minerals - they can mine faster than miners, lets give them mining access. oh and botany, armory and captain's office, they need to get some items from there for research.
chef need to cook - easy botany access. let botanists grow dank weed without being bothered by chef.
paramedic - obvious all access
i hope you got it