I would like to see the ability to give each attribute a discount. Say when I'm using attributes to sell different product sizes like selling liquid products with different bottle sizes. Instead of having to create a different product for each size I use attributes for the main product and each bottle/box size is and attribute with a different price but currently it seems that discounts can only be applied to the main product and not the attribute. This would save on having to create a lot of redundant product pages.

Also the ability to have multiple pricing would kick ass reatail/wholesale or per role. I think most of the carts have this implemented already or at least in module form.