Firstly:
-Give Engiborgs wood, wood tiles, and magnetic gripper.
-Give them both, and let them pick up with and manipulate with the gripper, Airlock/APC/Air Alarm/Fire Alarm Electronics. It's bananas that they can open and bolt/unbolt literally every door, but can't change the access on them or put in new ones in the event a traitor emags and tells them to break it/breaks a door with a bomb and they have to fix it. Also, the RCD only puts in unsecured airlocks, so it'd be good to be able to modify the access for those that way.
-Give Engiborgs disposal and atmos pipes. Let them be manipulated with the magnetic gripper too, if necessary.
-Give Engiborgs metal rods. Why do drones have this but not borgs?
Secondly:
Limited resources in terms of item stacks needs to go away. Make all the borg/drone tools consume power instead. For all borgs, not just Engiborgs and drones, though they need it the most. Assign a charge value to the different tools available, kind of like how the Secborg's taser and flash use up charge value, and Engiborg's RCD does - the more you use it, the faster you run out of power. This will give borgs more incentive to use their resources wisely - if every action they take consumes valuable power, then making inefficient actions would indirectly break their laws most of the time, as actions that unnecessarily force a borg to go to the charger means they have taken actions that endanger the crew due to their inaction during that time.
This also means that bigger power cells are worth far more than just a longer time between charges - an Engiborg with a hyper-capacity cell can repair MUCH more at a time than a default one in this system.
This also makes borgs more dangerous in malf AI rounds, which is good - They're pretty easy to disable as it is.
On a mildly related note, one can generate infinite metal and glass as a borg by placing it on a surgical operating table. I discovered this by accidentally clicking on the one in Robotics as a drone. While they were delighted, I don't think this should be abusable.