Currently you need to edit and save EVERY variant individually, which takes ages when you have several options within a product. At the very least, have the weight / dimensions fields available on the product information page, or have a master weight/dimension to bulk edit. The default weight and dimensions go to zero when you add variants ... so you can't set it before adding them ... and you can't upload a CSV with more than 3 options. It's so time consuming and frustrating currently.