Something that has been annoying me greatly is the "Show world tooltips" feature, that shows item labels for things such as Shells etc.
But what it doesn't do, that feels very limiting, is label/highlight containers.
Of course, some containers are meant to be secret/a reward for the observant player.
But for general purpose containers, the random barrels, crates and corpses of slain enemies, it would be great if Left-Alt also showed a label for those. Perhaps of the format "Barrel" for a previously unopened container, and "Barrel (Looted)" for an already looted container.
Would make the game much more playable for an explorer with traces of completionism such as myself.