Well since you put it out there.....
1. I would like to be able to upload to more than one shelf at a time, if this cannot be accomplish I would work with the upload tags to feature if it pointed to a custom column.
2. I would like to be able to upload the own feature also, I do not know why this is not standard with goodreads since I own all books that I put in there.
3. I would like to upload my read date and ratings and/or reviews though this is not critical.
4. This is just a thought but maybe someway to upload empty books into Calibre that the user selects from their recommended list.
But other than #1 and 2 which are critical choices, I would be happy with any improvements/changes you all can come with, especially CWatkins because she pushes me to reach higher with her organizational mind.
Nyn