I wrote this more out of curiosity and as an academic exercise rather than with a clear intention of what I wanted to do. But I think the final outcome is productive and could be used by almost any user (with or without the knowledge of Amazon product advertising API).
There's only a limited number of options. If you go through the code, you'll find that there's room for a lot more flexibility. I'll try to work on these if time permits. But since this is being done more out of personal interest, I might stop work if I get bored ;).
Please feel free to report any bugs you find and ask for features that you'd like to see. I'll definitely take more interest in the work if I see that it's serving a purpose.
This is my first WordPress plugin. So be a bit patient with it.