Hi oregon_1982,
To answer your specific query on separate category for a particular product - A new category is normally created when there are enough products in an existing category, and it is possible to improve buying experience of buyers by creating a new category.
If you are not able to find an exact category for your product, you may list it in the category that closely defines the product, or list it under everything else.
Regarding why you received no response from eBay - simplest reason was I did not happen to see this post. If you want to leave a suggestion, always post them on discussion board. However, if you are awaiting an answer, and your listings depend on the same, please use
Contact Us link to write to Customer support. This will ensure a fast response. While, we might not always be the best people to answer your question, we can always forward your suggestion to the concerned team for evaluation. So do keep writing in your suggestions.
Regards,
Sapana