It would be nice to be able to define an element in an hierarchy as standard element. This would mean that when splashing on the parent the full value would be written on this element rather than splashed onto all the underlying elements. This would save a lot of space in the cube and avoid having to always drill down to base level to input a value.
For example for a quick forecast I would like to forecast sales but do not want to forecast for every single product. I would like to be able to define a fallback item (e.g "Product not specified") and splash sales and not have it spread out among thousands of products or having to drill down to this default element making the input view awkward.