I would like to add a suggestion to this list.
I would like to be able to import either sprites or a sprite sheet as a new collection.
I am a coder, not a designer, and I love the potential of this tool to make my own assets. I also purchased the first and second asset packs as a bundle with this tool but am a little disappointed that I cannot use them as collections. Of course it is possible I am missing something.
I saw a post where instructions where given on how to create my own collection, but I don't have the graphics tools listed in the post.