We'll take a read through the comments here and are looking forward to answering questions and receive feedback. You may also email the NGINX development mailing list (info in blog post).
NGINX (nginx.com) | San Francisco (South Beach) | Technical Evangelist | Website Manager | Product Marketer | Python Developer | Sales Engineer
Powering half of the world’s busiest sites, NGINX is the heart of the modern web. We help millions of users deploy and deliver their sites and apps with performance, reliability, security, and scale.
It's a common question. As you correctly noted in the changelog, the vast majority of features have been placed in the open source version. The commercial product has gained great visibility and adoption but open source NGINX is very core to our company. In fact, development and feature releases to open source NGINX have rapidly increased since the inception of NGINX, Inc (the company) because it can support the development efforts :)
Have you seen nginScript (1)? It's a syntax for embedding snippets of JavaScript in your NGINX configuration. This allows for scripting application logic into standard NGINX config files via a very common and simple language. There's some more details and simple examples at this blog post.