Move the 3 Shipping parameters (Shipping Policy, weight, dimensions) to the "Variation Combinations" table. The reason: if a seller lists winter jackets in various sizes, a child's size Small jacket would weigh much less than an adult size XXL (for example). Accurate shipping cost is often a factor whether a buyer completes a sale.
Variations listings support up to 250 variations. When adding a unique photo for each of those 250 variations, it becomes increasingly time-consuming to scroll down the page to select the variation number as you move through the list towards the number 250, then scroll back up go back to the "upload photo" section. Definitely a carpel-tunnel generator for your index finger to have to scroll that much. One solution could be to replace the long list of variation numbers with a drop-down numbers list (next to the "upload photo" box) so that no scrolling would ever be needed. Alt + arrow-up or arrow-down hot-key to tab up or down the numbers in that drop-down would make that process super fast!
Note: it takes me 1 hour and 15 minutes to complete a 250-variations listing with 250 unique photos. The photo selection enhancement could cut that time down to perhaps 30 minutes or less.
