Those ideas are pretty neat, but i would suggest another rank just to make it more logic: Sergeant.
It would look like this:
Private: Breach charges and proximitry mines.
Sergeant: The Sergeant should be able to use EMPs that cut power from a room of their choice, all doors in that room will be locked for 30 seconds, useful for containing SCPs and D-Class.
Lieutenant: Be able to use motion trackers and camera systems from a tablet.
Commander: Just like in CB NTF mod, commanders can request disabling of security systems (eg: tesla gates if tesla gates will be in the game), it's the commander's responsibility to enable them again if they are not an obstacle anymore. The commander not being responsible could lead to SCPs escaping due to weak security or fellow comrades dying due to him not disabling them momentarily.