Yeah, I know what you mean. In games like BG, you could do as you say and just use it as a stash box. It always felt scary because you didn't quite trust the game to work as described, but it did. In the original Diablo, gold was so worthless that people would use it to draw pictures on the ground of Tristram, and it would always remember that picture, made up as it was from dozens or hundreds of gold piles.
But as I say, there's very likely to be a hard limit to remembered "out of place" items. An official confirmation would be cool, although it will most likely be so high it doesn't matter. I guess for now, just don't leave anything there that would depress the hell out of you if it vanished (in Fallout 2, quite apart from any item limit, items left in your car would randomly get deleted; now that was annoying as hell).
