Also the thing on the wall just looks like a bunch of natural gas pipes and regulators and shit stuck halfway into the drywall and painted yellow. Like someone just ran out to Home Depot to find some "futuristic" looking parts in the plumbing section. Also I'm pretty sure that's just a commercial fire alarm horn/strobe on the wall to the left.
He is wearing a small digital lens kit on the left eye that allows him to view and interact with holographic images and digitally generated moving parts. He looks like he is randomly miming nothing in thin air but he is actually remotely adjusting plasma vents and radiation emitters behind the bulkhead and operating moving parts on the outside of the ship from the safety of the inside.
Judging from the reactions of the rest of the crew walking past ... Ensign Jimmy Turny Knob is just going through a normal day at work.