I went ahead and created a few issues, optimization, and feature request tasks for WP-reCAPTCHA on its github project page. So far I’ve added a few which I am going to try to implement for version 3.0, the next release of the plugin. If you have any reports of bugs, suggested optimizations, or feature requests, you are more than welcome to create an issue yourself on that page. However, if you would rather not go through all the trouble of creating a github account, if you don’t already have one, you can also make a post about them on the WP-reCAPTCHA page. Those two places are where I would most likely see your contribution.