Hi Alessio,

thanks a lot for your help merging the pull request.

I already created a custom ResourceClassProcessor for the MVC 1.0 reference implementation Ozark which automatically adds @Produces("text/html") to all MVC controllers. 

See the corresponding code here:

https://github.com/chkal/ozark/tree/15920a07429b71a15fab8ae19e8e9cad50bba355/resteasy/src/main/java/org/mvcspec/ozark/resteasy/metadata

Would this be a proof of concept as you mention it?