As far as I'm aware, Novocrane is correct. The only way to do what the decker wants is for him to slave everything to his deck. That means the decker would have to have space for enough slaved devices so that the team's commlinks and all accessories can all be slaved. Usually this would be around 3 devices per team member, assuming all you're worried about protecting is commlink, vision enhancement, and weapon.
All that being said, accessories don't have to be slaved to function, it just leaves the individual parts vulnerable to hacking.
Also, unless the team is extremely tight on funds, it wouldn't be hard for each team member to buy Rating 6 commlinks, making the decker's "protection" likely no better than the individual runners on their own.