If only there was!
I am sure someone will create some kind of software for this eventually. If you are targeting a particular keyword then where is your book when you type that into Amazon?
I expect Amazon want to steer clear of people manipulating their searches!

Having just published on Kindle for the first time, been wondering about this too and couldn't come up with anything.

If you have a website, and I hope you do, put a survey widget on it with some kind of incentive to respond after they check out your Kindle book page. When they come back to fill out the survey, list 1 to 3 questions about what drew them there, what keywords they used, what they would change, etc.

OK so place a in your e-book's front page. Potential customers will click on it and that will give you an idea of how much traffic you are seeing. Most people will not buy your book unless it is inexpensive. For example, 99 cent e-books sell a lot more. Still, you get only 35% commission. That is not a lot of money. By having FREE offers you increase your exposure. Also, you can do an e-book give away. Key is to get readers to know who you are.

Well, this doesn't answer all the questions but it answers a few. Not a bad tool at all.

Bookalyzer by Author Marketing Club - What's Your Book Score?