Removing audio books from the list is easy to do, if they are identified as such in the returned results. Incidentally i had another look at the Amazon license and the following section seems to me to say that you can't use their API in any way except to increase the sales of their products, and I doubt getting calibre users to apply for developer accounts is a real workaround
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Subject to the terms of this License Agreement and solely for the limited purposes of advertising Products on, and directing end users to, the Amazon Site, we grant you a limited, revocable, non-transferable, non-sublicensable, non-exclusive, royalty-free license to (a) copy and display Product Advertising Content solely on your application; (b) use only those of our trademarks and logos that we may make available to you as part of Product Advertising Content (collectively, “Amazon Marks”) solely on your application and in accordance with the Trademark Guidelines; (c) access and use the Product Advertising API, Data Feed, and Product Advertising Content solely in accordance with the Specifications and this License Agreement; and (d) access and use the Specifications solely in connection with your access to and use of the Product Advertising API. The license set forth in this Section 6 will immediately and automatically terminate if at any time you do not timely comply with any obligation under this License Agreement, or otherwise upon termination of this License Agreement. Regardless of whether the license set forth in this Section 6 is terminated, you will immediately stop using the Product Advertising API and/or Data Feed and promptly remove from your application and delete or otherwise destroy any portion of or all Product Advertising Content, as requested by us.
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