Can I highlight interactive objects?
With the ALT key, I can highlight phat lewt that is scattered about. However, this doesn't highlight other interactive objects, such as barrels or other objects that can be destroyed/looted.
Is there some way to highlight these objects without just sweeping my mouse over them?
Nope - but missing one is not a big issue at all. Important things (including lore book containers) are sparkling/glowing anyway.