I run this plugin on a busy site for my company, and have made a few tweaks to it to squeeze out a bit more performance. I also optionally support the php-memcached extension. I'd love to share these changes so that they can benefit the product, and the many who are using it. It'd also keep us from having to re-lay our changes on top of each W3TC update :) .
Do you have a source code repo that accepts pull requests or things of the like? I could only find your svn repo info. In general, I think using something like Github or Bitbucket would do a lot to move development forward, since they're easy and commonplace methods of sharing and contributing code.
