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For concern #2, If they parameter names are found in the request, they are replaced in the url and removed from the POST form data. Full explaination here: http://amplifyjs.com/api/request/#url_substitution/routing

This is true, but the examples are incomplete. The "RESTful" POST example excludes parameters in the URL. Small mistake, but very confusing.

I'd fix it, but they don't mention how to submit patches.

They do mention it. It's a little bit hidden, but see http://amplifyjs.com/community/#pull_requests