Add ability to edit standard NGINX Domain Template

As a web hosting provider, I am trying to implement HTTP2 support for all of my accounts. Now that I'm using ea-nginx, I would like to be able to either edit the automatically generated templates for nginx domain configuration files so that the HTTP2 setting could be turned on by default or be able to check a box in EasyApache (as one can do with Apache) or the upcoming NGINX Manager that would enable the same. This would help provide the benefits of HTTP2 on top of the caching/proxying speed benefits gained via NGINX.