What I think would be a cool addition would be the cyclone missile launcher for the heavy specialist. Equipping it could make it so they have only a storm bolter and a power fist with the launcher. It would act like some sort of ability where you'd press a button and it would fire and have a cool down. Also adding perks and upgrades to the armor could have some sort of visual change like purity seals or even an iron halo. Just some thoughts.