attention: not so much beta, but check twice before using!
Q: Will you make the codes public?
A: Please check https://github.com/mow/apache2nginx also you can contact from: anil(at)saog.net
A: Yes I accept donations. Please use my paypal account: pp(at)saog.net
Q: Does it supports xxx?
A: This page has woozy codes, I dont know try it yourself and see. Backreferances, most of the variables and a few flags are supported.There are tons of fancy hacks for catching rewrite behavior of apache. As you see, it highly uses variables for deciding to rewriting and there must be many much errors/unmatched directives.