Part of what made BG2 feel so immersive and expansive to me was the huge number of random wilderness areas. Unexpected encounters while en route to unrelated destinations really gave it a feeling that anything could happen. You could stumble upon a new quest, a random bad-ass battle, or just a cool patch of terrain with a cave/forest/crazy old dude in a cabin/etc.
While these extra areas are not revolutionary additions to a game, I think it subtly makes the world seem more real and explorable.
As it doesn't sound like it will hurt development on anything else that is planned, I'd be more then happy to throw some more cash in that direction.
