One thing that bugged me about Divine Divinity was that the ALT key spoiled a lot of the puzzles. You could find too many secrets by running around with it held down. There are entire suits of armour hidden in the wilderness from adventurers who have long starved to death or stripped to run away quickly. And of course there are the keys. I think that items should have a hidden flag so that Larian can really hide hidden items. Then they could hide keys under rocks and you wouldn't just have to press ALT to find them, you'd have to move the rock first so that it was normally visible. For items that are camouflaged, they would remain hidden until you float the cursor over them, then they would show up normally when you press ALT.
What do others think?