In general I like your ideas. But you have to keep in mind that hyperspecialization is kinda tricky if the station lacks the numbers for it. I don't think boueshield would improve the game as making it harder for antags to succeed in killing captain and/or stealing certain items from them slows the game down.
Also I think the main problem is the lack of specific mechanics that can be assigned to the specific jobs, e.g. modfying genes, xenobiology etc.