Holding Lalt by default is supposed to highlight items for you, the issue is that it does not highlight interactable containers like chests.
Yeah, I'm hoping that at the moment object highlighting just isnt' fully implemented. I also switched all the L-Alt options to TAB and Vice Versa. Tab has always been my goto highlight key and i was constantly unsheathing and sheathing the weapons when it was tied to Alt. ;p