Coupon Code / Promotion Usability Upgrades
Right now it's difficult to do promotions 100% how you want. In a store with many products that are each assigned to multiple categories, if we want to run a promotion on only certain products we cannot simply select and category, on the Discounted Item List in the coupon setup area. We have to go through and select each and every individual product and click "Add'. If that page allowed you to simply select multiple products at once (ie. hold Cntrl + select items) that would be world changing.
Also, allowing us to set up promotions such as "Buy Item A, Get Item B Free" , etc would be a huge upgrade. What would be perfect is if no coupon code was needed for that functionality, ie. customer adds item A to cart, when they then add item B the cart adjusts the cost of Item B to zero. But even if a coupon code is needed to get the discount it still is a great functionality.