I agree with mystazsea - that would be very useful. When I have dozens of objects on one layer, many of them overlapping each other, it's a real pain to try and select one. I'd love an expandable layers palette like photoshop where I can hide and lock individual objects or folders of objects, and not be limited to hiding/locking the entire layer. Even with multiple things on multiple layers, as soon as my project gets reasonably complicated I start wishing for this feature.