Had fun with this. Couple of things I noticed:
1. Defo a bug with "toggle grab" - you can right click an item and grab, right click again to drop. But if you right click elsewhere (not on an item) beforehand, a subsequent right click hovering over an item does nothing, you need another right click to grab again. I'm guessing its just a boolean being toggled but not checking if we're hover an item beforehand. A similar thing happens when throwing a toggled grab also.
2. I'm not sure but I THINK I'm softlocked at the elevator. I hit the button on the outside and the big box dropped without me in it. Not sure if I'm just doing something wrong though