1. Quote Categories: Many people who are searching will be doing so by the category, such as "success" or "excellence", not the author. I understand that you can add a tag, but that really doesn't help much.
2. Assigning an Author to multiple Quote Categories: Again, we have "author X" who has been quoted in the category of "success" and "excellence"
3. Being able to add Authors and Quotes inside the Admin area, not by adding a drop down menu on the front end and adding them there.
If there are any plans on adding these features soon, we would sure like to know.
Thank you for your valuable feedback. We are adding categories support in the next release.