I completely agree with the need for this. There really needs to be an option to do bulk edits from the All Packages page much like how you are able to do bulk edits to specific posts from the All Posts page in WordPress (i.e., you can bulk assign categories, tags, etc.). Having the ability to bulk edit Link Template, Page Template, categories, and tags from selected packages on the All Packages page is highly needed.
The Default Values plugin has its uses, but it is an “all or nothing” option. Not everyone wants to assign the same exact Page template or settings to every single product.
Thanks for your consideration!